Policy changed the car
A sourced timeline of the federal actions that changed how cars are designed, built, tested, sold, serviced, and fueled in the United States.
199 milestones
How to use this catalog
This catalog includes material federal statutes and final rules affecting passenger cars and light trucks since 1970. It separates rules in force from superseded standards, phase-ins, and rulemakings Congress required but an agency has not finalized.
It is a historical research guide, not legal advice. The linked federal source controls, and current compliance questions should be checked against the U.S. Code and eCFR.
2026–1970 · newest first
Showing all 199 milestones
Petroleum-Equivalent Fuel Economy Calculation
Removed the fuel-content factor from DOE's petroleum-equivalency calculation after a federal appellate decision vacated the 2024 revision. EPA uses the resulting petroleum-equivalent fuel economy value when calculating manufacturers' light-duty CAFE compliance; DOE said further revisions would proceed through a later proposal.
Rescission of the Greenhouse Gas Endangerment Finding and Motor Vehicle Greenhouse Gas Emission Standards Under the Clean Air Act
Rescinded EPA's 2009 greenhouse-gas endangerment finding and repealed federal GHG emission standards for light-, medium-, and heavy-duty highway vehicles and engines. The action does not repeal traditional-pollutant standards or NHTSA CAFE rules.
Resetting the Corporate Average Fuel Economy Program
States NHTSA's current interpretation that prohibited statutory factors cannot be used when setting maximum-feasible fuel-economy standards and says the agency will apply that interpretation when enforcing existing standards pending replacement rulemaking. This is an interpretive rule, not itself the replacement numerical CAFE standards.
USMCA Implementing Regulations for Automotive Goods
Implemented USMCA preferential-tariff and related customs provisions for automotive goods, including origin-related customs treatment, drawback and duty-deferral programs, recordkeeping, protests, fees, and conforming changes. This is an interim final customs rule; it is not a vehicle-safety or owner-service requirement.
Federal Motor Vehicle Safety Standards Nos. 307 and 308 — Hydrogen Vehicle and Storage Integrity
Established crash and normal-operation integrity requirements for hydrogen vehicle fuel systems and compressed onboard hydrogen storage. The two standards address leakage, fire, and storage-system explosion risks and apply to motor vehicles that use hydrogen as fuel.
Child-Restraint Anchorage Ease-of-Use Amendments
Revised lower-anchor and tether requirements to improve accessibility, labeling, installation space, and correct child-restraint use in covered vehicles while coordinating the rules for child restraints and vehicle anchorage systems.
Hybrid III 5th-Percentile Female Crash-Test Dummy Specification Revision
Revised the Hybrid III 5th-percentile female dummy's chest-jacket and spine-box specifications to reduce jacket variation and eliminate a crash-test signal-noise source. The action changes the regulated test device, not the injury limits vehicles must meet.
Enhanced Front- and Rear-Seat Belt Reminder Systems
Expanded the driver's warning, added a front-outboard-passenger warning, and required rear-seat status and change-of-status warnings in covered new light vehicles. An effective April 2026 interim final rule delayed and unified the principal compliance date at September 1, 2028 while NHTSA considers comments.
Federal Motor Vehicle Safety Standard No. 305a
Replaced FMVSS 305 with expanded propulsion-battery electrical, thermal-propagation, water-exposure, post-crash, and emergency-response-information requirements for electric-powered vehicles. A February 2025 rule delayed the original effective date to March 20, 2025.
Expanded Event Data Recorder Pre-Crash Capture
Expanded specified pre-crash EDR metrics from five seconds at 2 Hz to 20 seconds at 10 Hz for vehicles equipped with an EDR. NHTSA's May 2026 reconsideration rule delayed implementation to a four-year phase-in beginning September 1, 2028; it did not create a universal requirement that every vehicle carry an EDR.
Motor Vehicle Safety Whistleblower Program Rule
Established procedures for people with original motor-vehicle safety information to submit claims and seek awards when their information contributes to a successful covered enforcement action. NHTSA briefly delayed enforcement of the new procedural requirements to March 20, 2025.
Federal Motor Vehicle Safety Standard No. 210 — Seat-Belt Anchorage Test Amendments
Clarified how the required anchorage-strength test device is positioned and added an optional test device and procedure as a certification alternative after a court found the former procedure did not give manufacturers adequate notice.
Ten-Year Motor Vehicle Safety Record Retention
Doubled from five to ten years the period that vehicle, child-restraint, and tire manufacturers must preserve specified records concerning possible safety-related malfunctions, implementing a FAST Act mandate.
CAFE Standards for MY 2027–2032 Passenger Cars and Light Trucks
Sets the next cycle of fuel-economy standards and compliance rules for passenger-car and light-truck fleets.
Federal Motor Vehicle Safety Standard No. 127
Requires automatic emergency braking, including pedestrian detection, to meet specified performance tests on new light vehicles.
Multi-Pollutant Emissions Standards for MY 2027 and Later Light-Duty Vehicles
Originally combined fleet-average greenhouse-gas and criteria-pollutant limits. EPA's 2026 final action repealed the vehicle GHG standards; traditional-pollutant requirements were not rescinded by that action.
Automobile and Light-Duty Truck Surface-Coating Emission Standards
Updated volatile-organic-compound limits and work practices for prime-coat, guide-coat, and topcoat operations at newly constructed, modified, or reconstructed automobile and light-truck coating facilities after May 18, 2022. The rule also updated capture/control testing, monitoring, recordkeeping, electronic reporting, and startup/shutdown/malfunction treatment. Related 2006, 2007, and 2020 actions addressed the vehicle-coating hazardous-air-pollutant standards; these are factory requirements, not owner maintenance rules.
Upgraded Rear Underride Protection
A 2004 action precisely defined the work-equipment area for special-purpose trailer exclusions and another allowed required guard labels in a less damage-prone, inspectable location. The 2022 upgrade raised guard strength and energy absorption to protect compact and subcompact passenger-vehicle occupants in specified 35-mph crashes; NHTSA denied reconsideration in 2024. These standards regulate covered trailers and their guards, not an owner repair specification or a guarantee of protection in every underride crash.
Federal Motor Vehicle Safety Standard No. 213a — Child-Restraint Side-Impact Protection
Created a federal side-impact performance test for covered child restraints. Later amendments aligned and clarified the 213, 213a, and 213b procedures; NHTSA's 2025 notice pauses 213a enforcement rather than repealing the standard.
Standard Reference Test Tire Update
Replaced an unavailable reference tire used as the testing baseline for treadwear ratings, snow-tire traction definitions, and pavement-friction evaluation. The action updates how regulated tests are calibrated; it does not impose a new tire specification on an owner's vehicle.
HFO-1234yf Vehicle Listings and Small-Can Service Fittings
Required unique fittings on two-pound-or-smaller R-1234yf cans used to service onroad and nonroad vehicles, updated incorporated SAE safety standards for prior onroad listings, and allowed R-1234yf for specified newly manufactured nonroad-vehicle air-conditioning uses subject to conditions.
CAFE Standards for MY 2024–2026 Passenger Cars and Light Trucks
Raised fleet fuel-economy targets across three model years and updated compliance calculations and credit provisions.
Occupant Protection for Vehicles With Automated Driving Systems
Updated crashworthiness terminology so vehicles designed without traditional steering wheels, pedals, or driver seating positions remain subject to equivalent occupant-protection requirements. The rule did not authorize unsafe deployment or establish how an automated-driving system must perform the driving task.
Make-Inoperative Exemptions for Disability Modifications
Expanded limited exemptions allowing qualified modifications for people with disabilities, including changes involving roof-crush, rear-visibility, and airbag requirements. It also permits temporary knee-bolster-airbag modification by rental companies when installing hand controls under the rule's conditions.
Adaptive Driving Beam Final Rule
Permitted adaptive driving-beam headlamps that reshape high beams to reduce glare while preserving illumination. NHTSA denied the rule's reconsideration petitions in December 2024 without changing the standard.
Inflation Reduction Act Clean Vehicle Credits
Reworked new and used clean-vehicle credits around final assembly, battery components, critical minerals, income, price, and foreign-entity rules.
Revised Light-Duty Greenhouse-Gas Standards for MY 2023–2026
Made EPA's light-duty greenhouse-gas fleet standards more stringent for model years 2023 through 2026 and added temporary compliance flexibilities. EPA's 2026 final action later repealed the federal vehicle GHG standards; this card records the historical requirement rather than presenting it as current law.
HFO-1234yf Motor-Vehicle Air-Conditioning Service Equipment Standards
Incorporated updated SAE standards J2843, J2851, and J3030 for equipment that recovers, recycles, or recharges R-1234yf in motor-vehicle air conditioners. The rule regulates certified servicing equipment and industry practice; it does not create a maintenance interval for an individual vehicle.
Infrastructure Investment and Jobs Act — Advanced Impaired Driving Technology
Directs NHTSA to establish a standard for passive technology that detects or prevents impaired driving when feasible. Driver-facing cameras are one possible approach, not a currently final federal camera mandate.
Q3s Three-Year-Old Child Side-Impact Test Dummy Specification
Added design and performance specifications for the instrumented Q3s dummy used to evaluate how child restraints protect small children in side impacts. The 2021 reconsideration corrected drawing dimensions, tolerances, and assembly material; it did not itself impose a new child-restraint requirement.
SAFE Vehicles Rule for Model Years 2021–2026
Revised federal carbon-dioxide and fuel-economy standards for passenger cars and light trucks and required roughly 1.5 percent annual stringency increases for model years 2021–2026. Later EPA and NHTSA rules replaced the affected later-model-year standards; this is a historical engineering and policy milestone, not the current numerical requirement.
American Innovation and Manufacturing Act
Mandated a national phasedown of hydrofluorocarbons, affecting refrigerant supply and the transition of mobile air-conditioning technology.
Odometer Disclosure Requirements — Electronic Records and 20-Year Exemption
Allowed states to use electronic odometer disclosures and extended the federal mileage-disclosure period from 10 to 20 model years for 2011-and-newer vehicles. Model year 2010 and older vehicles retain the former 10-year exemption rule.
SAFE Vehicles Rule Part One — Federal Preemption and California Waiver Withdrawal
Withdrew part of California's Clean Air Act waiver for its greenhouse-gas and zero-emission-vehicle programs and codified NHTSA's view of fuel-economy preemption. NHTSA repealed its rule and preamble positions in 2021; this card records the historical action rather than a current bar on state regulation.
Small-Can Motor-Vehicle Refrigerant Sales Clarification
Clarified that two-pound-or-smaller cans of non-exempt substitute motor-vehicle refrigerant made or imported before January 1, 2018 without a self-sealing valve could continue to be sold to people who are not certified refrigerant technicians. EPA withdrew the earlier direct-final version after adverse comment and issued this final action.
Electronic EPA Declarations for Imported Vehicles and Engines
Harmonized Clean Air Act documentation for imported vehicles and engines and allowed the required EPA declaration forms to be filed electronically with Customs and Border Protection. It changed the import-compliance filing process; it did not waive emissions conformity or make a nonconforming vehicle legal to import.
Used Motor Vehicle Trade Regulation Rule — Revised Buyers Guide
Revised the dealer window Buyers Guide to explain warranty coverage and as-is sales more clearly, recommend checking vehicle-history and recall information, identify additional major defects, and improve Spanish-language disclosures. It applies to covered used-car dealers, not private-party sales.
Vehicle Theft Prevention Exemptions for Immobilizer-Equipped Vehicles
Created performance criteria manufacturers can use when seeking parts-marking exemptions for vehicle lines equipped with qualifying electronic immobilizers. It streamlines a manufacturer petition process and does not guarantee that every immobilizer-equipped vehicle is exempt.
E-Warranty Act Amendments to Warranty Disclosure Rules
Allowed warrantors to post warranty terms online, subject to conditions including a non-Internet way to obtain them, and allowed certain sellers to show those terms electronically before sale. The rule still requires pre-sale availability; it did not make warranty disclosure optional.
Motor Vehicle Safety Act Civil Penalty Factors
Interpreted the mandatory and discretionary factors NHTSA uses when determining civil penalties or compromises under the Vehicle Safety Act, and updated specified odometer-fraud and false-information penalties. It guides federal enforcement; it does not create an owner maintenance duty.
Automotive Fuel Ratings — Ethanol Blend Labels
Added rating, certification, and pump-label requirements for specified ethanol-gasoline blends to help purchasers identify the fuel offered and select fuel appropriate for their vehicles. A later dispenser-specific label-format exemption did not change the general rating rule.
Federal Motor Vehicle Safety Standard No. 141
Set testable minimum sound requirements for electric and hybrid vehicles during low-speed operation. NHTSA's 2018 amendment allowed manufacturers to provide multiple compliant alert sounds and clarified testing requirements; it did not eliminate the minimum-sound mandate.
FAST Act Motor Vehicle Provisions
Expanded recall and safety oversight and authorized a low-volume replica-vehicle program. NHTSA's 2022 implementation permits qualifying low-volume manufacturers to produce or import a combined annual total of up to 325 replica vehicles under specified exemptions and equipment rules.
Rear License-Plate Mounting Angle Amendment
Allowed rear license plates on all motor vehicles to be mounted as much as 30 degrees upward from vertical when the plate's upper edge is no more than 1.2 meters above the ground, increasing design flexibility and harmonization. This is a federal new-vehicle equipment rule; state display, visibility, obstruction, and registration laws still govern an owner-installed plate or frame.
Defect and Noncompliance Notification — Dealer Notice and Replacement-Equipment Refund Rules
NHTSA's 2005 reconsideration revised details of manufacturer notifications to dealers and distributors after a safety defect or standards noncompliance is decided. Its 2015 action clarified that a replacement-equipment manufacturer may tell purchasers in the required notice that it intends to remedy the problem by refunding the purchase price. These rules govern recall communications and remedies; a service bulletin or customer-satisfaction campaign is not automatically a federal safety recall.
Tire Identification and Recordkeeping Amendments
Expanded new-tire plant codes from two to three symbols and standardized tire-identification-number length at 13 symbols for new tires and seven for retreads. The change makes incomplete identification numbers easier to spot and supports safety-recall identification.
Tier 3 Motor Vehicle Emission and Fuel Standards
Tightened fleet-average tailpipe limits and reduced gasoline sulfur, treating vehicles and fuels as a coordinated emissions system.
Federal Motor Vehicle Safety Standard No. 111 Rear Visibility
Required a rearview image meeting field-of-view, response-time, image-size, durability, and deactivation criteria.
NCAP Rearview-Video Recommendation Update
Added qualifying rearview-video systems to the New Car Assessment Program's recommended crash-avoidance technologies and stopped listing electronic stability control as an optional recommended feature after ESC became mandatory for all light vehicles. This consumer-information action preceded, and is distinct from, the later FMVSS 111 rear-visibility mandate.
Early Warning Reporting and VIN-Based Recall Lookup Amendments
Standardized product names in quarterly early-warning reports, added recalled-tire identification ranges and component country-of-origin reporting, then required covered manufacturers to support VIN-based safety-recall lookup, submit recall information online, expand light-vehicle reporting categories, and revise owner notices. The 2014 reconsideration also required owner letters when a remedy is available. These manufacturer reporting duties support defect detection and recall access; they do not mean every complaint or campaign is a federal safety recall.
Repeal of Federal Motor Vehicle Insurer Theft Reporting
Repealed the federal rule that required motor-vehicle insurers to report thefts, recoveries, and theft-deterrence actions after MAP-21 removed NHTSA's authority for that collection. It did not repeal vehicle parts-marking or manufacturer theft-prevention requirements.
FMVSS 109 Temporary-Spare Tire Dimension Test Pressure
Raised the regulated physical-dimensions test pressure for T-type temporary-use spare tires from 52 to 60 psi, modestly increasing test stringency and aligning the federal test with international and voluntary standards. This is a manufacturer compliance-test value, not an instruction to inflate every temporary spare to 60 psi; owners must use the pressure marked for their tire and vehicle.
Motor Vehicle Certification Label Language
Required specified certification language on labels affixed to covered vehicles manufactured for U.S. sale. These labels certify conformity with applicable federal safety standards; they are distinct from a vehicle's VIN plate and fuel-economy window label.
Light-Duty GHG and CAFE Standards for MY 2017–2025
Accelerated engine, transmission, aerodynamics, lightweighting, hybrid, and electric-vehicle deployment through the mid-2020s.
Retrofit Air-Bag On-Off Switch Authorization Extended
Extended by three model years the regulation allowing a dealer or repair business to install a retrofit air-bag on-off switch after NHTSA approved a request from the vehicle's owner or user. The rule did not authorize an owner to disable an airbag without approval, and its vehicle-manufacture cutoff is historical rather than a current blanket permission.
SNAP Acceptance of Carbon Dioxide (R-744) for Motor-Vehicle Air Conditioning
Listed carbon dioxide refrigerant, R-744, as acceptable subject to use conditions in motor-vehicle air-conditioning systems specifically designed for it. Acceptance under SNAP is not a retrofit instruction and does not permit charging R-744 into a system designed for another refrigerant.
Child-Restraint Standard Expanded Through 80 Pounds
Extended FMVSS 213 to child restraints sold for children weighing 65 through 80 pounds, established specifications and qualification requirements for the Hybrid III 10-year-old child dummy, and adopted that dummy for compliance tests of newly covered restraints. A 2014 reconsideration clarified the required label while denying most requested substantive changes; the federal weight range is not a substitute for each seat's height, weight, and installation instructions.
Fuel Economy and Environment Label
Added fuel consumption, projected fuel costs and savings, greenhouse-gas and smog ratings, advanced-technology metrics, and a QR code to new-vehicle window labels. It did not change EPA's fuel-economy test methodology or manufacturers' CAFE compliance values.
Clean Alternative Fuel Vehicle and Engine Conversion Compliance
Created age-dependent compliance options for conversion-system manufacturers seeking protection from Clean Air Act tampering liability when converting vehicles and engines to clean alternative fuels. It did not make an uncertified owner-installed conversion automatically lawful.
Automotive Fuel Rating Rule — Alternative Octane Method
Allowed an alternative method for determining and certifying gasoline octane ratings and made related Fuel Rating Rule revisions. The action governs rating and posting practices; it did not alter the octane required by an individual vehicle.
SNAP Acceptance of HFO-1234yf for New Light-Vehicle Air Conditioning
Listed HFO-1234yf as acceptable, subject to use conditions, in newly manufactured passenger-car and light-truck air-conditioning systems as an alternative to CFC-12. The rule authorized a refrigerant/design path; it did not require every new vehicle to use R-1234yf.
Federal Motor Vehicle Safety Standard No. 226 — Ejection Mitigation
Established an impactor-based performance standard intended to reduce complete and partial occupant ejection through side windows, especially in rollovers, for covered vehicles at or below 10,000 pounds GVWR. NHTSA anticipated longer-lasting, more extensively tethered side-curtain airbags or other compliant designs; the rule did not mandate one named technology or require owners to retrofit existing vehicles.
Federal Motor Vehicle Safety Standard No. 305 — Modern Electric-Shock Protection
Modernized post-crash electrical-isolation and low-voltage compliance paths for battery, hybrid, and fuel-cell vehicles, then added protection against direct and indirect contact with high-voltage sources during normal operation. A 2019 clarification addressed tool-separated high-voltage connectors. FMVSS 305 remains relevant during the phased transition to FMVSS 305a.
Light-Duty Vehicle Greenhouse Gas and CAFE Standards for MY 2012–2016
Created the first coordinated national greenhouse-gas and fuel-economy program for cars and light trucks.
Brake-Transmission Shift Interlock Requirement
Required specified vehicles with an automatic transmission and a Park position to prevent shifting out of Park unless the service brake is depressed, in every starting-system key position. The rule addresses unintended rollaway; it does not guarantee that a parked vehicle cannot move or replace parking-brake use.
Tire Fuel Efficiency Consumer Information Program — Test and Reporting Rules
Established manufacturer test methods and reporting for replacement passenger-car tire rolling resistance, wet traction, and treadwear. The rule did not itself finalize how comparative information would be displayed to shoppers, so this milestone is not described as a universal federal tire label.
Pedestrian Safety Enhancement Act
Directed minimum sound requirements for electric and hybrid vehicles so pedestrians can detect them at low speeds.
Advanced-Technology Fuel-Economy Administration Amendments
Added manufacturer reporting for applicable reformed CAFE targets and clarified that EPA may allow special test procedures, calculations, and label formats for electric, fuel-cell, plug-in hybrid, hydrogen-combustion, and other advanced vehicles. The action administered existing label and CAFE programs; it did not create a single owner-comparable test method for every advanced powertrain.
Upgraded Roof-Crush Resistance Standard
A 1999 amendment made the test plate position more repeatable for rounded and raised roofs and kept it over the front occupants. The 2009 upgrade doubled the roof-strength test force to three times unloaded vehicle weight for covered vehicles at or below 6,000 pounds GVWR, extended a 1.5-times requirement through 10,000 pounds, added a two-sided test, and required preservation of headroom. In 2010 NHTSA further answered industry comments and denied petitions seeking a different heavier-light-vehicle strength ratio and a dynamic rollover test. These are new-vehicle structural performance tests, not an owner inspection method or proof that a damaged roof remains compliant.
Corporate Average Fuel Economy Standards for Model Year 2011
Set the one-year model-year 2011 passenger-car and light-truck CAFE standards while NHTSA reconsidered its approach for later years under the Energy Independence and Security Act. NHTSA projected a 27.3 mpg combined industry average; CAFE is a manufacturer fleet-compliance program, not the window-label MPG or a mileage requirement for an individual vehicle.
Electronic Tire Registration and Recordkeeping
Allowed manufacturer-owned tire sellers to use electronic registration and created additional electronic options for buyers and independent dealers while retaining dealer and manufacturer recordkeeping duties. Registration helps manufacturers contact owners about tire recalls; it does not certify tire condition, fitment, or remaining service life.
Designated Seating Position Measurement Rules
Clarified which interior areas are designated seating positions, established how manufacturers count positions on longer seat surfaces, and removed the blanket exclusion for temporary or folding auxiliary seats. Reconsideration delayed applicability, removed express state-tort preemption text, refined the measurement procedure, and corrected an inadvertent formula change. This classification connects positions to applicable crash-protection requirements; it does not tell owners how many unbelted occupants may ride in a vehicle or make an improvised seating area safe.
Automotive Fuel Ratings — Biodiesel and Biomass-Based Diesel Labels
Added federal rating, certification, and retail-pump labeling requirements for biodiesel and biomass-based diesel blends so purchasers can identify the blend being sold. It governs fuel marketers and labels, not a claim that every diesel vehicle can use every blend.
R-152a Motor-Vehicle Air-Conditioning Refrigerant Approval
Listed R-152a as an acceptable substitute for ozone-depleting substances in motor-vehicle air-conditioning systems when the rule's use conditions are met. The action gave manufacturers and suppliers another system-design option; it did not authorize owners to replace a vehicle's specified refrigerant or bypass service-equipment, labeling, or technician requirements.
Cameron Gulbransen Kids Transportation Safety Act
Directed rear-visibility, brake-shift-interlock, and power-window protections; the resulting camera rule reached all new light vehicles in May 2018.
Federal Motor Vehicle Safety Standard No. 108 — Lighting Standard Reorganization and Restoration
Reorganized the federal lighting standard and moved sealed-beam light-source figures into Part 564 without intentionally creating new substantive requirements. NHTSA delayed effectiveness while resolving petitions, corrected technical errors, and restored color and wide-vehicle side-marker requirements that had been removed during reorganization. This history governs manufacturer certification and regulated replacement equipment; it does not make a lamp, bulb, color, or modification lawful or optically correct for a particular vehicle by appearance alone.
Cargo-Carrying-Capacity Consumer Labels
Required load-capacity information for motor homes and recreation-vehicle trailers and required parties adding more than the lesser of 1.5 percent of GVWR or 100 pounds to a completed vehicle before first retail sale to disclose that added weight. For ordinary light vehicles, this is a pre-sale added-weight labeling boundary—not a new universal cargo rating or permission to exceed the factory placard.
Federal Motor Vehicle Safety Standard No. 214 — Dynamic Pole Side-Impact Test
Updated the moving barrier from specified bias-ply to radial tires, then added a dynamic vehicle-to-pole test, advanced ES-2re and SID-IIs dummies, enhanced injury criteria, and further updated the moving-barrier test to improve head and chest protection for a wider occupant range. A 2011 reconsideration made minor test changes and clarifications. NHTSA expected technologies such as curtain and torso airbags, but the performance rule did not require every vehicle to use a particular airbag design or retrofit older vehicles.
Federal Motor Vehicle Safety Standard No. 126 — Electronic Stability Control
Required electronic stability control on covered passenger cars and other light vehicles at or below 10,000 pounds GVWR. The system selectively brakes wheels to help the driver recover directional stability; reconsideration actions refined technical and test-procedure details without turning ESC into automated driving or overriding safe speed and tire-condition limits.
Mobile Source Air Toxics Rule
Limited gasoline benzene content, added cold-temperature hydrocarbon and evaporative-emission standards for passenger vehicles, and regulated portable fuel-container emissions to reduce benzene and other hazardous air pollutants. These manufacturer, refinery, and container standards are not an owner fuel-additive requirement or a basis for removing factory emissions equipment.
Energy Independence and Security Act
Reformed fuel-economy standards and directed a combined passenger-car and light-truck fleet target of at least 35 mpg by 2020.
EPA Fuel-Economy Estimate and Window-Label Method Update
Revised window-label fuel-economy calculations to account for higher speeds, harder acceleration, air-conditioning use, and cold temperatures, producing estimates intended to better reflect real driving. It also redesigned the label and extended labeling to specified medium-duty passenger vehicles beginning with model year 2011. The estimates remain standardized comparisons, not a promise of the mileage any owner will achieve.
Advanced Adult Side-Impact Crash-Test Dummies
Established the ES-2re mid-size adult male and SID-IIs small adult female side-impact dummies with instrumentation and qualification requirements for improved injury assessment, then refined their tests, performance corridors, drawings, and manuals. The devices support repeatable compliance testing across occupant sizes; their adoption is not itself a requirement that every vehicle contain a particular side-airbag design.
New Car Assessment Program Safety Ratings on the Monroney Label
Required covered new passenger vehicles to display available NHTSA NCAP safety ratings on the Monroney price label, clarified how the information is presented, and later revised the label for the enhanced program's overall vehicle score derived from frontal, side, and rollover ratings. The label reports government test information available for that new vehicle; it is not a warranty, a prediction of every crash outcome, or a safety rating for an untested trim by inference.
Reformed Light-Truck CAFE Standards for Model Years 2008–2011
Introduced footprint-based fuel-economy targets for light trucks, allowing a transition between traditional and reformed compliance before making the reformed structure mandatory for model year 2011. A manufacturer's obligation depended on its production-weighted vehicle mix. This was a fleet-compliance rule, not a window-label estimate or an MPG requirement for an individual truck.
Event Data Recorder Standard
Standardized the data elements, survivability, and retrieval of voluntarily installed event data recorders; it did not itself require every vehicle to have one.
Hybrid III Six-Year-Old Weighted Child Dummy Revisions
Refined the Hybrid III six-year-old weighted child dummy after reconsideration, then changed femur design and material for durability and corrected abdomen drawings to match field parts. These actions standardize the regulated test device; they do not change a child's restraint-use instructions or create an owner inspection for crash dummies.
Light-Vehicle Evaporative, Refueling, Dynamometer, and Label Certification Amendments
Reduced specified evaporative and refueling certification-test burdens, harmonized parts of the federal procedure with California's, added four-wheel-drive dynamometer provisions, and removed outdated vehicle-label information without changing program stringency. These are manufacturer certification procedures; they do not alter an owner's emissions label, inspection requirement, evaporative-system diagnosis, or legal replacement-part choice.
Child-Restraint Registration and Recall-Notice Amendments
Allowed required child-restraint registration forms to mention online registration, permitted manufacturers to supplement—but not replace—first-class-mail recall notices with email, and required a U.S. telephone number on the registration label. Registration helps a manufacturer reach the current owner during a recall; it does not verify installation, expiration, crash history, or suitability for a child or vehicle.
Federal Motor Vehicle Safety Standard No. 209 — Seat-Belt Assembly Test Amendments
Removed an unenforceable wording provision about keeping the lap belt on the pelvis while retaining enforceable pelvic-restraint requirements across FMVSS 208, 209, and 210. Later rules redefined emergency-locking-retractor requirements, added an acceleration-time test corridor and instrumentation specifications, and resolved reconsideration petitions. These are assembly certification tests, not permission to substitute an unverified belt, buckle, retractor, or mounting hardware.
Federal Motor Vehicle Safety Standard No. 500 — Low-Speed Vehicle Definition
Removed the blanket exclusion of trucks from the low-speed-vehicle class, initially limited covered vehicles to less than 2,500 pounds GVWR, and then raised the ceiling to less than 3,000 pounds. These amendments changed which qualifying vehicles could fall within the federal LSV equipment framework; they did not authorize LSV operation on every public road, raise the class's speed limit, or override state and local operating restrictions.
Federal Motor Vehicle Safety Standard No. 101 — Controls, Telltales, and Indicators Update
Updated the required location, identification, illumination, and display treatment for regulated controls, telltales, and indicators, including multifunction controls and multitask displays. Reconsideration refined symbol proportions, illumination, common-space limits, and contrast rules; a later amendment waived the horn symbol only when the horn control is centered on the steering wheel. The standard governs specified safety controls and warnings, not the usability or meaning of every icon or screen a manufacturer adds.
Federal Motor Vehicle Safety Standard No. 301 — Upgraded Fuel-System Integrity Tests
Upgraded rear- and side-impact fuel-system integrity tests and, on reconsideration, provided additional lead time or phase-in treatment for covered vehicles over 6,000 pounds GVWR, multistage manufacturers, alterers, and small-volume manufacturers. The standard limits fuel leakage in regulated new-vehicle crash tests; it is not an owner leak inspection, fuel-line replacement specification, or assurance that a crashed or corroded system remains safe.
Federal Motor Vehicle Safety Standard No. 102 — Stop/Start Starter-Interlock Amendment
Clarified starter-interlock requirements for propulsion systems that automatically stop and restart an internal-combustion engine, seeking to prevent unexpected vehicle motion after a driver selects the wrong direction. Reconsideration adjusted timing and addressed specified heavy hybrid systems. The rule governs new-vehicle shift and restart logic; it does not diagnose a particular no-start, rollaway, selector, or transmission fault.
Certification Rules for Vehicles Built in Two or More Stages
Expanded pass-through certification beyond chassis-cab vehicles, created a temporary-exemption process for specified dynamic requirements, and generally gave intermediate and final-stage manufacturers and alterers one additional year for new standards. Reconsideration clarified vehicle-type treatment and exemptions while retaining certification and recall responsibilities. The framework allocates manufacturer duties; it does not make a later owner conversion federally certified or erase the final-stage label and recall record.
CAFE Credits and Fines Through Corporate Changes
Established how CAFE credits and civil-penalty liabilities are allocated when manufacturers merge, split, acquire brands, or otherwise change corporate relationships. This is manufacturer fleet-compliance accounting; a transferred credit does not change an individual vehicle's window-label estimate, fuel requirement, or real-world economy.
Federal Motor Vehicle Safety Standard No. 106 — Brake-Hose Specifications Update
Updated the federal brake-hose standard to incorporate substantive SAE specifications for hydraulic and vacuum brake hoses, air hoses, plastic air-brake tubing, and end fittings. NHTSA delayed the effective date by one year while addressing reconsideration petitions, then denied several requests and repaired omissions and typographical errors. FMVSS 106 sets performance, labeling, and test requirements for regulated hose and assemblies; it does not by itself identify the correct replacement hose for a vehicle or authorize reuse of damaged fittings.
Federal Motor Vehicle Safety Standard No. 202a — Upgraded Head Restraints
Raised front-seat head-restraint height, limited backset and gaps, and added strength and dynamic requirements to reduce whiplash in rear impacts, while regulating voluntarily installed rear-outboard restraints. Reconsideration delayed and phased requirements, averaged backset measurements, adjusted the seat-back reference angle, refined rear non-use positions and retention tests, and made technical corrections. These are new-vehicle design and certification requirements; owners still need to position an adjustable restraint for the occupant rather than assume the regulated maximums guarantee protection in every rear impact.
Rear-Seat Lap-and-Shoulder Belt Requirement
Required integral lap-and-shoulder belts at forward-facing rear designated seating positions, with a lap-belt option retained for side-facing positions. This new-vehicle requirement does not establish that every earlier vehicle can accept a safe universal three-point-belt retrofit; anchorage structure and vehicle-specific instructions still matter.
Federal Motor Vehicle Safety Standard No. 116 — Brake-Fluid Test Update
Removed an evaporation test that NHTSA found unnecessary after changes in brake-system design and fluid formulations, and revised the corrosion test for better repeatability and reproducibility. FMVSS 116 sets performance and labeling rules for regulated brake fluids; it does not determine the DOT grade or product specification required by an individual vehicle.
FTC Tire Advertising and Labeling Guides Rescission
Rescinded the FTC's 1968 passenger-tire advertising guides after the Commission found many provisions obsolete or duplicated by NHTSA tire-label rules, the FTC Act, and other advertising and warranty guides. Removing Part 228 did not legalize deceptive tire claims, erase federal safety labels, or establish replacement-tire fitment; unfair or deceptive advertising remained subject to Section 5 of the FTC Act and other applicable rules.
Federal Motor Vehicle Safety Standard No. 118 — Safer Power-Window Switches
Required covered new-vehicle switches for power windows, partitions, and roof panels to resist accidental closing actuation, updated automatic-reversal tests for infrared and light-beam systems, and implemented the congressional pull-to-close switch mandate. Reconsideration extended the pull-to-close compliance date but rejected broader exclusions for reversal-equipped, overhead, and vent-window switches. These design rules reduce entrapment risk; they do not establish that every older vehicle has automatic reversal or make a closing window safe for unattended children.
Registered Importer Certification and Enforcement Rules
Clarified duties for registered importers bringing in vehicles not originally manufactured to meet U.S. safety, bumper, and theft-prevention standards, including applications, certification, records, and suspension or revocation procedures. It did not approve every Canadian-market vehicle or let an owner bypass eligibility and conformity requirements.
TREAD Act Recalled-Tire Disposition Rules
Required a tire manufacturer's recall-remedy plan to address preventing replaced recalled tires from being resold for vehicle installation, limiting landfill disposal within the manufacturer's reasonable control, and reporting implementation. NHTSA later clarified that the TREAD Act did not bar use of recalled tires in landfill construction. The rule does not make a recalled tire safe for road reuse or replace the need to check the tire identification number against recall records.
FMVSS 108 Signal-Lamp Visibility and Harmonization
Updated visibility and photometric requirements for turn-signal, stop, tail, and parking lamps and allowed a transition to harmonized requirements before they became mandatory. This regulates new vehicles and replacement lighting equipment; state laws still govern owner use, and a brighter or differently colored aftermarket lamp is not necessarily legal, properly aimed, or compatible.
Alternative-Fuel Dual-Fuel Vehicle CAFE Incentive Extension
Extended for model years 2005–2008 the special fuel-economy calculation incentive for manufacturers producing qualifying dual-fuel vehicles capable of using alternative fuel as well as gasoline. The program influenced flex-fuel vehicle production and fleet CAFE accounting; it did not guarantee that those vehicles were operated on alternative fuel or create an owner fuel requirement.
NCAP Dynamic Rollover Resistance Ratings
Added dynamic maneuver testing to NHTSA's New Car Assessment Program rollover-resistance ratings and defined how the agency would combine test results with static stability information for consumers. The rating program provides comparative information; it did not impose a new vehicle-certification standard or guarantee that a vehicle will not roll over.
Federal Motor Vehicle Safety Standard No. 139 — Upgraded Light-Vehicle Tire Performance
Created more stringent high-speed, endurance, and low-pressure performance tests for new tires used on covered light vehicles at or below 10,000 pounds GVWR. Reconsideration adjusted requirements for snow and specialty tires, and NHTSA later denied a further petition while making technical corrections. These are tire-manufacturer compliance tests; they do not replace the vehicle placard, tire sidewall limits, load and speed ratings, or exact fitment requirements when selecting a replacement tire.
Federal Motor Vehicle Safety Standards Nos. 403 and 404 — Accessible-Vehicle Platform Lifts
Established equipment and installation standards for motor-vehicle platform lifts, including platform dimensions, gaps, handrails, warnings, retaining barriers, wheelchair retention, strength, slip resistance, interlocks, installation, and user information. Reconsideration, delays, and a 2012 update refined lighting, control, warning-signal, roll-stop, and test requirements. These federal design and installation rules do not replace the lift manufacturer's operating, inspection, maintenance, securement, or recall instructions.
Federal Motor Vehicle Safety Standard No. 110 — Tire Safety Information
Added standardized tire and loading placards for covered new light vehicles, improved tire identification for recalls, and required consumer information about load limits and inflation. Reconsideration refined the label and allowed selected additional information. The placard identifies the vehicle manufacturer's original size, load, and cold-pressure specification; replacement fitment still requires checking the vehicle, tire, wheel, load rating, and applicable manufacturer guidance.
Child-Restraint Ease-of-Use Rating Program
Established a consumer-information program rating child restraints on features that can make correct use easier. The ratings provide comparative purchase information and impose no binding product-design obligation. A rating does not establish that a restraint fits a particular child or vehicle, is installed correctly, has not expired or been in a crash, or is free of recalls.
Federal Motor Vehicle Safety Standard No. 138 — Tire Pressure Monitoring Systems
The initial TREAD Act rule created short-term warning options for covered light vehicles; after judicial review, NHTSA's 2005 replacement required a system that warns when one or more tires is significantly underinflated. Later reconsideration refined indicator and malfunction-display details. TPMS is a warning system, not an automatic inflation device or a substitute for checking pressures against the vehicle placard.
Guides for the Rebuilt, Reconditioned and Other Used Automobile Parts Industry
Retained and later revised FTC guidance intended to prevent deceptive marketing of rebuilt, reconditioned, and other used automotive parts. The guides address how sellers describe part condition; they are not a federal fitment certification or a vehicle maintenance schedule.
Federal Motor Vehicle Safety Standard No. 138
Required tire-pressure monitoring systems that warn drivers when a tire is significantly underinflated.
Disability-Modification Exemptions for Required Safety Equipment
Created and then expanded limited make-inoperative exemptions so qualifying businesses can perform documented disability accommodations affecting specified required safety equipment, including advanced-airbag, child-restraint-anchor, upper-interior-impact, side-impact, head-restraint, or ejection-mitigation provisions. The head-restraint action added the right-front passenger position and people with limited ability to support their head. This is a framework for covered modifiers and documented accommodations, not a blanket owner exemption from federal safety standards.
Original FMVSS 305 Effective-Date Delay
Temporarily delayed the original electric-vehicle electrolyte-spillage and shock-protection rule during the 2001 regulatory review. It changed timing only; it did not repeal FMVSS 305, alter the covered voltage/weight scope, or authorize owner work on a high-voltage system.
Original NCAP Static Rollover-Risk Ratings
Added a Static Stability Factor-based rollover-risk rating for passenger cars, multipurpose passenger vehicles, and light trucks to NCAP and noted electronic stability control equipment. The consumer rating compares tested vehicle configurations; it is not an FMVSS certification requirement or a guarantee that a particular vehicle will or will not roll over.
Advanced Air Bag Rule
Required improved frontal crash protection while reducing airbag injury risk to children and smaller occupants through sensing and suppression strategies. Early actions standardized and refined the advanced six-year-old, three-year-old, 12-month-old, and 5th-percentile-female crash-test dummies used to evaluate those risks. Reconsideration refined injury criteria, dummy and child-restraint positioning, warning telltales, suppression testing, and the first-stage manufacturer phase-in; temporary and limited-line provisions changed certification timing without weakening the rule into an owner exemption. A 2006 rule raised the belted frontal-barrier test maximum to 35 mph for the 5th-percentile adult-female dummy, matching the male-dummy test speed, and a 2007 reconsideration allowed one year of early-compliance credits while correcting small-manufacturer phase-in text. NHTSA separately delayed and then finalized repeatable LATCH-based suppression tests, periodically replaced the child restraints used to evaluate suppression and low-risk deployment, retained lockable seat belts for installing child restraints after the expected sunset, and updated that test-restraint list again in 2024. These are certification tests and test-fixture updates, not proof that every airbag deploys identically for every restraint, occupant, or crash.
Transportation Recall Enhancement, Accountability, and Documentation Act
Expanded defect reporting and recall accountability and directed tire-pressure monitoring requirements after the Firestone tire crisis. Implementing rules required reporting knowing sales or leases of notified defective tires, limited sale or lease of defective or noncompliant vehicles and equipment, established early-warning and record-retention reporting, required reports about substantially similar foreign recalls, authorized accelerated remedies when a serious-risk recall could not finish reasonably, required reimbursement plans for eligible pre-notification repairs, and required manufacturers to schedule specified defect or noncompliance notices to dealers and distributors. Later actions refined fields, schedules, and submission dates. These reporting and remedy procedures support defect investigation and recalls; a report, complaint, service bulletin, foreign campaign, or customer program is not by itself a U.S. safety recall or proof that an individual vehicle has a defect. Owners should verify open recalls by VIN.
TREAD Act Criminal-Reporting Safe Harbor
Defined the time and manner for correcting an improper safety-defect report or failure to report under the TREAD Act's narrow criminal-penalty safe harbor. Protection depends on statutory conditions and prompt correction; it does not excuse misleading reports, erase civil liability, convert an unreported problem into a recall, or create an owner reporting deadline.
TREAD Act Safety Penalties and Free-Remedy Period
Conformed NHTSA rules to TREAD Act increases in Vehicle Safety Act civil penalties and extended the manufacturer no-charge defect/noncompliance remedy period from eight to ten years, including registered-importer obligations. The action does not extend every warranty to ten years, guarantee parts availability, or mean every repair campaign is a safety recall.
Federal Motor Vehicle Safety Standard No. 401 — Interior Trunk Release
Required covered passenger-car trunks to have an inside release or qualifying automatic alternative so a trapped person can escape. Reconsideration clarified exclusions and front-trunk latch behavior while retaining the core escape requirement. The standard does not mean every enclosed cargo area or older vehicle has a release, and a child should never play in or around a trunk.
Federal Motor Vehicle Safety Standard No. 305 — Original EV Electrolyte and Shock Protection
Established post-crash electrolyte-spillage, battery-retention, and electrical-isolation requirements for electric vehicles above 48 volts and at or below 10,000 pounds GVWR, excluding low-speed vehicles, then clarified battery state-of-charge and isolation test conditions on reconsideration. These were manufacturer crash-test requirements, not instructions for an owner or technician to test, open, or repair a high-voltage battery system.
FMVSS 304 CNG Container Performance-Based Amendments
Reaffirmed the carbon-fiber-container burst safety factor, removed prescriptive material and manufacturing-process requirements to permit innovation, and corrected the hydrostatic-burst stress-ratio text. These are container certification tests; they do not authorize an owner pressure test, establish universal service life, or replace the container label and vehicle-specific inspection instructions.
Original Electric-Vehicle Petroleum-Equivalency Factor
Established a petroleum-equivalency factor and calculation procedure so electric-vehicle values could enter a manufacturer's CAFE fleet calculation. This is regulatory fleet accounting, not the vehicle's EPA window-label efficiency, electricity consumption, charging cost, or real-world range.
Uniform Tire Quality Grading Treadwear Test Update
Revised the base-course wear-rate calculation and age/use controls for course-monitoring tires to make passenger-tire treadwear grades more consistent over time. UTQG treadwear is a comparative controlled-test grade, not a mileage warranty, exact service-life prediction, safety rating, or substitute for correct tire size, load, speed, and vehicle fitment.
12-Month-Old Child Crash-Test Dummy Specifications
Standardized a 12-month-old infant dummy and then refined its instrumentation, impact-probe, material, drawing, and calibration specifications. The laboratory device supports airbag and restraint research and compliance testing; it is not a child-restraint size rating, does not simulate every infant, and does not make front-seat use of a rear-facing restraint safe in front of an active airbag.
Offset Deformable Crash-Test Barrier Specification
Standardized the deformable barrier face used when one side of a vehicle's front structure is subjected to an offset crash test. The action specified a laboratory test device; it did not by itself create a vehicle performance requirement, rate an individual vehicle, or establish an owner inspection method after a crash.
Electric-Vehicle Regenerative-Brake Test Amendment
Allowed regenerative braking to operate under specified conditions during an electric vehicle's regulated brake test while retaining thermal-test stringency. This is a manufacturer certification procedure, not a service mode, stopping-distance promise, or instruction to diagnose or alter a regenerative-braking system.
Tier 2 Motor Vehicle Emissions Standards and Gasoline Sulfur Control
Applied the same emissions framework to cars, SUVs, pickups, and vans while sharply reducing gasoline sulfur. During the 2006 ultra-low-sulfur-diesel transition, EPA kept the June 1 refinery start but gave terminals and retailers 45 additional days and temporarily allowed slightly over-15-ppm downstream fuel to be sold as ULSD. EPA later allowed three model years of environmentally neutral alternative compliance for limited clean-diesel conditions and exempted three Pacific territories from Tier 2 gasoline-sulfur requirements while retaining vehicle-emission standards there. These historical transition provisions do not change the fuel required by a particular vehicle today.
Altered-Vehicle Safety, Bumper, and Theft Certification Label
Required a vehicle alterer's certification label to state that the vehicle, as altered, conforms to applicable federal safety, bumper, and theft-prevention standards affected by the alteration. The label is the alterer's certification; it does not mean every later modification is covered or make an uncertified alteration safe.
Show-or-Display Vehicle Importation
Created the limited show-or-display import path for a vehicle of exceptional historical or technological significance that cannot readily be brought into FMVSS compliance, with approved road-use conditions and a 2,500-mile annual insurance limit. It is an individual federal approval process, not a general 25-year exemption, registration guarantee, or permission to import and drive any foreign-market model.
Four-Digit Tire Date Code
Changed the tire identification date from three to four digits and reduced the minimum character size, improving manufacturing-date traceability across centuries and recalls. The code identifies week and year of manufacture; it does not establish a universal expiration date, remaining service life, recall status, or correct vehicle fitment.
Passenger-Car CAFE Domestic-Fleet Accounting for Mexican Production
Implemented a NAFTA provision allowing a manufacturer to elect the model year in which qualifying Mexican component production and vehicle assembly count as domestic value added when NHTSA assigns passenger cars to the manufacturer's domestic or import fleet for average-fuel-economy calculations. This is manufacturer fleet-accounting treatment; it does not change an individual vehicle's EPA window-label estimate, fuel requirement, country-of-origin label, or actual fuel economy.
FTC Magnuson-Moss Warranty Rules and Guides Review
Completed FTC review of Magnuson-Moss interpretations, written-warranty disclosure, pre-sale availability, informal dispute-settlement, and warranty-advertising guidance while retaining their consumer-protection framework. The rules govern warranty terms and practices; they do not create a warranty where none was offered, guarantee coverage for a particular repair, or decide a specific dispute without the actual warranty and facts.
Light-Truck CAFE Standards for Model Years 2001–2007
Set manufacturer light-truck fleet standards at 20.7 mpg for model years 2001–2004, 21.0 mpg for model year 2005, 21.6 mpg for model year 2006, and 22.2 mpg for model year 2007. The first three actions retained the prior model year's 20.7-mpg standard as directed by annual appropriations provisions; the later actions set the 2004 and 2005–2007 standards. These were fleet-average compliance values, not EPA window-label estimates or MPG guarantees for an individual pickup, van, or SUV.
Sport-Utility Vehicle Rollover Warning Label
Replaced the text-only rollover warning for covered small and midsize utility vehicles with a graphical visor label and expanded owner's-manual guidance, then allowed combined airbag/rollover labels and early compliance. The warning addressed handling and rollover risk; it was not a crash rating, proof that one SUV would roll over, or permission to exceed tire, load, speed, or seating limits.
Federal Motor Vehicle Safety Standard No. 225 — Child-Restraint Anchorage Systems
Established standardized upper tether and lower child-restraint anchorages in covered new vehicles and corresponding child-restraint attachments. Reconsideration temporarily allowed alternative strength and test provisions, refined anchorage configuration, marking, location, and testing, adjusted timing for final-stage manufacturers and alterers, prohibited stowable lower anchors after a short transition, and permanently excluded narrowly defined funeral coaches. The rule does not mean every seating position or older vehicle has lower anchors, and it does not replace the child-restraint and vehicle manuals for seating-position, weight, tether, or installation limits.
Light-Vehicle ABS Malfunction-Lamp Test Delay
Delayed the mandatory compliance date for a revised ABS malfunction-indicator activation protocol so manufacturers could complete system design and testing. The temporary certification timing change did not alter the meaning of an illuminated ABS warning for an owner or authorize driving without diagnosis and repair.
Light-Truck and MPV Theft-Standard Certification Label
Required certification labels on covered multipurpose passenger vehicles and light trucks at or below 6,000 pounds GVWR to state conformity with applicable federal theft-prevention as well as safety standards. The certification statement does not identify which parts are marked, prove theft history, or establish replacement-part compatibility.
Dual-Fuel Electric Passenger-Car Minimum Range
Set 7.5-mile urban and 10.2-mile highway electric-driving thresholds for a qualifying dual-fuel electric passenger car to receive the statutory special CAFE calculation. These were manufacturer fleet-accounting eligibility tests, not advertised EV range, battery-health guarantees, or owner fuel-use requirements.
Ten-Model-Year Odometer Disclosure Exemption
Restored the categorical federal odometer-disclosure exemptions after a court decision raised questions about NHTSA's authority and clarified that the former exemption for a vehicle ten years old or older was calculated by model year. Later rules extended disclosure to 20 model years for MY 2011 and newer vehicles; MY 2010 and older vehicles retain this historical ten-model-year treatment. An exemption from the federal transfer statement is not proof of actual mileage or freedom from state title and fraud law.
Federal Motor Vehicle Safety Standard No. 500 — Original Low-Speed Vehicle Standard
Created a federal low-speed-vehicle class for qualifying four-wheeled vehicles with a top speed above 20 mph and no more than 25 mph and required specified basic safety equipment. FMVSS 500 is a new-vehicle equipment standard; it does not authorize an LSV on every road, replace state registration and operating law, or make a golf cart an LSV without meeting the federal definition and certification requirements.
Uniform Lap/Shoulder-Belt Anchorage Strength Test
Required all lap/shoulder-belt anchorages to meet the same 6,000-pound certification-strength test even where a lap-only belt could otherwise have been installed. This is a regulated new-vehicle test load, not a tow rating, repair torque, or approval for an aftermarket belt or mounting point.
Metric Conversion of Federal Tire Safety Standards
Converted specified English-unit measurements in federal tire, rim, and consumer-information standards to metric values without intending to change stringency, and allowed weight-unit abbreviations on specified non-passenger-vehicle tire labels. The regulatory conversion does not change a vehicle's placarded tire size, pressure, load limit, or replacement fitment.
Metric Conversion of Federal Motor Vehicle Safety Standards
Converted specified English-unit measurements in selected Federal Motor Vehicle Safety Standards to metric units in two rulemaking waves. NHTSA expressly said the conversions were not intended to change the standards' stringency. The converted regulatory values govern certification testing; rounding them back to familiar units is not an owner repair specification or permission to substitute a near-sized part.
Side-Impact Dummy Repeatability Amendments
Added lumbar-spine spacers and a ribcage-damper positioning procedure to reduce inconsistent signal spikes from the regulated side-impact dummy. The amendments improve compliance-test repeatability; they do not change a vehicle's equipment, diagnose an airbag, or predict an individual crash outcome.
Law-Enforcement Rear-Seat Belt Adjustment Exception
Allowed specified forward-facing rear-outboard belts in police and other law-enforcement vehicles to use manual adjustment and limited exceptions intended to facilitate prisoner transport. The rule is vehicle- and seating-position-specific; it does not permit removal or alteration of rear belts in an ordinary passenger vehicle.
Authorized Retrofit Airbag On-Off Switches
Allowed a dealer or repair business to install a key-operated retrofit airbag on-off switch only after NHTSA approved an owner or user's request for a person in a defined risk group. A follow-up clarified the switch key, telltale, and readiness-indicator text, and reconsideration left the core approval system in place. The rule never authorized arbitrary owner disconnection, removal, coding, or installation of a universal switch.
Hybrid III Six-Year-Old and Weighted Child Test Dummies
Aligned the six-year-old dummy drawings with its actual thorax center of gravity and ballast placement, refined the advanced Hybrid III device used for airbag and restraint evaluation, then added a 62-pound weighted version for compliance tests of child restraints recommended above 50 pounds. The standardized laboratory devices did not themselves change a restraint's labeled child-size limits or substitute for its instructions.
Rear-Facing Child-Seat Airbag Warning Clarifications
Allowed carefully qualified wording explaining when a rear-facing child restraint could be used after a vehicle system deactivated the frontal airbag and alerted the driver. The amendment did not weaken the core warning: never place a rear-facing restraint in front of an active airbag, and always follow both manuals.
Temporary Airbag Depowering Test Alternative
Temporarily let manufacturers certify less-aggressive airbags using an unbelted sled test instead of the full unbelted barrier crash test, extended associated interior-impact treatment so depowering was not delayed, then made three interim rules permanent and clarified sled setup and injury measurements. The interim approach addressed injuries from early aggressive deployments while advanced-airbag requirements were developed; it did not make an older airbag safe to disable or modify.
FMVSS 114 Park-Position Test Clarification
Clarified when service brakes are released during the automatic-transmission park-position compliance test and removed outdated phase-in text. It corrected a certification-test ambiguity; it does not diagnose a rollaway, prove a used shifter is safe, or authorize bypassing an interlock.
Light-Truck Safety-Belt Fit Phase-In Extension
Granted a four-month compliance extension for the safety-belt-fit requirements applying to vehicles above 8,500 and below 10,000 pounds GVWR. This was a narrow manufacturer phase-in adjustment, not an exemption allowing occupants to ride unbelted or owners to alter a belt system.
On-Board Diagnostic Requirements
Made standardized onboard emissions diagnostics and the familiar diagnostic connector a nationwide requirement for new light-duty vehicles. EPA's 2005 action finalized two provisions withdrawn from a 2003 direct final rule after adverse comment and clarified smaller manufacturer-certification issues. OBD fault codes identify a monitored-system result; they do not by themselves diagnose the failed component or authorize replacing a part without vehicle-specific troubleshooting.
Hybrid III Adult and Side-Impact Dummy Refinements
Refined Hybrid III femur, ankle, neck-transducer, clothing, shoe, and pelvis specifications and corrected the SID/HIII neck calibration corridor used in side-pole testing. These changes improve repeatability and biofidelity of regulated laboratory devices; they do not add crash-test dummies to vehicles or predict an individual occupant's injury outcome.
Enhanced Airbag and Rear-Facing Child-Seat Warning Labels
Required prominent visor and temporary dashboard warnings for airbag-equipped vehicles and an enhanced warning on rear-facing child restraints, followed by corrections for vehicles without rear seats and the exact label wording. NHTSA later denied requests to remove or weaken the labels. The warnings supplemented—not replaced—the rule to place a rear-facing restraint away from an active frontal airbag and follow the vehicle and restraint instructions.
Headlamp Concealment and Visual/Optical Aiming Amendments
Moved operative-headlamp-concealment requirements into FMVSS 108, added an objective visual/optical aiming option, and later allowed the comparable UN/ECE concealment-device provision. These rules govern certified headlamp systems and their aiming features; they do not make an owner-installed lamp, LED conversion, or concealment modification compliant without the correct vehicle-specific optics and equipment certification.
Uniform Tire Quality Grading AA Traction and Consumer-Disclosure Updates
Corrected test pressures for specified high-pressure passenger tires, added the top AA wet-traction grade, stabilized the treadwear base-course rate, and later moved general UTQG information from new-car point-of-sale material into owner's manuals while excluding tires with rim diameters of 12 inches or less. UTQG grades are comparative controlled tests, not replacement-tire fitment approval, a mileage warranty, or a prediction of wet braking for a particular vehicle.
Federal Motor Vehicle Safety Standard No. 205 — Automotive Glazing Amendments
Allowed specified rigid-plastic glazing in side-window applications, incorporated the 1996 ANSI glazing standard, consolidated federal performance requirements, limited windshield shade-band size, and then refined the update through delayed compliance, an aftermarket compliance option, inventory lead time, and corrections. FMVSS 205 governs regulated glazing locations, marking, performance, and installation; it does not mean any transparent plastic or aftermarket tint is lawful or safe in every window or jurisdiction.
Truck-Camper Loading Information Consolidation
Moved truck-camper loading provisions into one consumer-information regulation and removed the separate VIN requirement for each slide-in camper. The consolidated labels and loading information do not override a truck's certification label, payload, axle, tire, or camper-specific limits.
Seat-Belt Colorfastness Requirement Rescission
Removed the federal seat-belt colorfastness test after NHTSA concluded manufacturers already had market incentives to prevent dye transfer to clothing. It did not remove belt strength, elongation, webbing, buckle, retractor, labeling, or vehicle-specific replacement requirements.
American Automobile Labeling Act Content-Label Amendments
Refined the domestic/foreign parts-content calculation and labeling program, including temporary treatment when suppliers did not provide content data and later statutory amendments. The label is a defined fleet/carline content disclosure; it does not prove where every part was manufactured, identify final vehicle quality, or establish replacement-part origin or fitment.
Light-Truck CAFE Standards for Model Years 1998–2000
Set the manufacturer light-truck fleet standard at 20.7 mpg for model years 1998, 1999, and 2000 under the applicable appropriations directions; the MY 1998 rule's effective date was briefly delayed for Congressional-review legislation. These are fleet-compliance values, not EPA window-label estimates or an MPG guarantee for an individual pickup, van, or SUV.
Alternative-Fuel Dual-Fuel Minimum Driving Range
Set a 200-mile non-petroleum-fuel driving-range threshold for qualifying natural-gas and other non-electric dual-fuel passenger automobiles and defined gallon-equivalent measures for specified gaseous fuels. NHTSA twice denied requests to lower that threshold. This was manufacturer CAFE-incentive eligibility, not advertised range, a fuel-availability promise, or an owner operating requirement.
Used-Car Buyers Guide Placement and Receipt Amendments
Allowed a covered dealer to display the Buyers Guide conspicuously elsewhere on a used vehicle instead of only a side window, allowed an optional signed receipt disclosure, and made minor Spanish-language corrections. The Guide records warranty or as-is disclosures; signing it does not waive rights created by applicable law or prove a vehicle's condition.
Replaceable Headlamp Light-Source and HID Rules
Moved replaceable-headlamp-source specifications into the public information docket and allowed long-life high-intensity-discharge sources in replaceable-bulb systems under reduced dimensional submissions when rated for at least 2,000 hours. These manufacturing provisions do not make an HID bulb or conversion kit legal, optically compatible, correctly aimed, or safe in a housing designed for another source.
Federal Motor Vehicle Safety Standards Nos. 303 and 304 — CNG Labels and Tests
Allowed an appropriate fuel for the CNG-container bonfire test, added vehicle and container labels, later revised inspection-interval information, and refined the bonfire procedure while terminating then-unripe additional container proposals. These actions regulate new CNG vehicle and container certification; they do not establish a universal owner replacement interval or authorize an owner pressure or fire test.
Guide Concerning Fuel Economy Advertising for New Automobiles
Conformed the advertising guide to EPA's adjusted city and highway ratings, then modernized guidance for avoiding deceptive claims based on EPA ratings, non-EPA tests, vehicle configuration, range, and alternative fuels. The guide advises advertisers; it does not change EPA vehicle-label test procedures or guarantee that an owner will reproduce an advertised estimate.
Federal Motor Vehicle Safety Standard No. 206 — Door Locks and Retention Components
Extended latch, hinge, and lock performance requirements from side doors to back doors on covered passenger cars and multipurpose passenger vehicles, followed by a phase-in and trunk-lid clarification. A 2007 harmonization added and updated sliding-door, secondary-latch, inertial-load, small-bus, and wheelchair-platform-lift provisions; later actions delayed the sliding-door compliance date and resolved reconsideration petitions. These are new-vehicle component and crash-retention tests, not a substitute for repairing a door that will not latch or checking an applicable safety recall.
Federal Motor Vehicle Safety Standard No. 201 — Upper-Interior Head-Impact Protection
Required covered light vehicles to limit head-impact forces at upper-interior pillars, rails, headers, and roof components. Reconsideration refined the phase-in and tests; later rules allowed dynamically deploying head-protection systems such as inflatable curtains under additional deployment and pole-crash tests, established the test dummy used for that alternative, adjusted timing for altered and multi-stage vehicles, and refined door-frame and belt-mount targets. These are new-vehicle interior-impact performance requirements; they do not certify an aftermarket trim, roll-bar pad, headliner repair, curtain-airbag modification, or modified interior as crash-safe.
Qualified Electric and Clean-Fuel Vehicle Tax-Credit Recapture Rules
Defined a qualified electric vehicle and established recapture rules for the former EV credit and clean-fuel vehicle or refueling-property deduction created by the Energy Policy Act of 1992. These historical tax rules are not the current clean-vehicle credits and do not establish present eligibility for a vehicle or charger.
Light-Truck and MPV Dynamic Side-Impact Protection
Extended the passenger-car dynamic side-impact test to light trucks, multipurpose passenger vehicles, and buses at or below 6,000 pounds GVWR. The performance standard does not require a specific airbag design, guarantee protection in every crash, or establish retrofit compatibility for an older vehicle.
Federal Motor Vehicle Safety Standard No. 213 — Child-Restraint Testing, Labels, and Webbing
Expanded the child-size test-dummy range, strengthened rear-facing airbag warnings and booster-seat labels, updated restraint labels and written instructions, extended testing to restraints recommended through 65 pounds, and set minimum breaking strength for restraint and attachment webbing. Later actions managed six-year-old dummy transitions and modernized registration, labeling, test devices, school-bus restraints, and the standard seat assembly. These are manufacturer compliance, performance, and labeling requirements; they do not replace the restraint's instructions or override its stated height or weight limits, the vehicle manual, installation limits, expiration, crash-history guidance, or recall status.
Vehicle Stopping-Distance Consumer Disclosure Rescission
Rescinded a manufacturer consumer-information requirement after NHTSA found its stopping-distance figures had little comparative value and could mislead buyers across real conditions, then reaffirmed the decision on reconsideration. It did not weaken FMVSS brake-performance standards or imply that published stopping tests are interchangeable across tires, surfaces, weather, load, and technique.
Brake-Hose, Brake-Fluid, and Whip-Test Amendments
Specified a replacement referee material for regulated brake-hose and brake-fluid compatibility tests and allowed a supplemental support in the hose whip test so a potentially safer assembly design was not inadvertently prohibited; NHTSA later denied reconsideration. These laboratory standards do not identify a vehicle's correct hose, fluid specification, fittings, or service procedure.
Federal Motor Vehicle Safety Standard No. 114 — Temporary Key-Removal Amendment
Temporarily narrowed when an automatic-transmission lock had to prevent key removal while manufacturers resolved uncertainty about the earlier rollaway-prevention language, then restored the broader Park-only rule after September 1, 1996. It also corrected the towing-override provision for key-operated devices. This historical amendment does not replace current starting-system, Park-lock, parking-brake, or recall instructions for a particular vehicle.
Passenger-Airbag Deactivation and On-Off-Switch Controls
Allowed a manufacturer-installed manual passenger-airbag cutoff in a vehicle with no rear seat, or a rear seat too small for a typical rear-facing infant restraint, and later extended that option while automatic protection developed. Follow-up actions corrected the visor warning and allowed a clearly visible interior on-off telltale rather than requiring it on the dashboard. These historical new-vehicle provisions did not authorize an owner to disable an airbag or install an arbitrary switch.
Federal Vehicle Defect, Recall-Notice, and Record-Retention Procedures
Updated manufacturer defect and noncompliance reports, recall schedules, record retention, lessee records and notices, second owner notifications, and NHTSA petition and initial-defect-determination procedures. Follow-up actions delayed specified provisions and reduced burden on reconsideration without abandoning the recall program. These rules govern agency and manufacturer procedures; a complaint, service bulletin, investigation, or customer program is not automatically a federal safety recall, and owners should verify open recalls by VIN.
Replaceable Headlamp Light-Source Information Amendments
Allowed vehicle and headlamp manufacturers, as well as light-source manufacturers, to file dimensional and other replaceable-bulb information in NHTSA's public docket and established a process for modifying a filed light source without making its predecessor impermissible. The filing system supports standardized replacement-light-source specifications; it does not mean every bulb with a similar base is legal or optically correct for every headlamp.
FMVSS 108 Headlamp, Stop-Lamp, and Lens-Material Test Updates
Corrected and retired outdated headlamp photometric points, allowed grouped test points for center high-mounted stop lamps, and updated the plastics and haze-test standards used for lighting lenses. These are manufacturer and equipment-certification tests; they do not establish that a visually similar replacement lens, lamp, or bulb has the correct beam pattern, color, intensity, or fitment for a particular vehicle.
Federal Motor Vehicle Safety Standard No. 135 — Light-Vehicle Brake Systems
Created FMVSS 135 for passenger-car braking, added provisions for electric-vehicle regenerative braking, and extended the harmonized standard to covered trucks, buses, and multipurpose passenger vehicles at or below 3,500 kilograms GVWR. These are new-vehicle stopping, warning, and system-performance tests; they do not identify replacement pads, fluid, rotors, or service intervals for a specific vehicle.
Federal Motor Vehicle Safety Standard No. 303 — CNG Fuel-System Integrity Reconsideration
Resolved petitions about the new compressed-natural-gas vehicle fuel-system crash test, retaining the allowable post-crash pressure-drop limit while granting and denying portions of requested pre-test and procedural changes. FMVSS 303 evaluates a complete vehicle's CNG fuel-system leakage after a regulated crash test; it is distinct from FMVSS 304's container-integrity and label rules and is not an owner leak-test procedure.
Reflector Haze and Driver-Glare Standard Changes
Made the outdoor-exposure haze limit for plastic reflex-reflector materials objective without changing applied stringency, then rescinded a separate standard for reflective metallic surfaces in front of the driver after NHTSA concluded the rescission would not harm safety. Neither action approves a tinted, painted, deteriorated, or aftermarket lighting surface for road use.
Tier 1 Light-Duty Vehicle Emission Standards
Lowered allowable tailpipe pollution and drove broader use of electronic fuel control, improved catalysts, and engine-management systems.
Intermodal Surface Transportation Efficiency Act Airbag Requirement
Required driver and front-passenger automatic crash protection, making dual front airbags standard in new light vehicles.
Clean Air Act Amendments of 1990
Established tighter Tier 1 tailpipe controls, reformulated gasoline, onboard diagnostics, evaporative-emissions controls, and clean-fuel programs.
Imported Vehicle Safety Compliance Act
Created the registered-importer framework and eligibility process for nonconforming vehicles imported into the United States. A 2005 reconsideration allowed registered importers to bring in vehicles modified for theft-standard compliance and permitted limited pre-bond-release road operation solely for required EPA testing; the 2006 decision retained parts-marking certification. Later rules tightened importer eligibility, renewal, removed-equipment handling, and temporary-import procedures. These are importer and petition requirements; they do not make a nonconforming vehicle automatically eligible for ordinary road use.
Truth in Mileage Act
Strengthened odometer disclosure and recordkeeping to reduce mileage fraud in used-vehicle sales.
Federal Motor Vehicle Theft Prevention Standard
Required identifying marks on major parts of specified high-theft passenger-car lines. A 2004 rule extended marking to non-exempt below-median-theft passenger cars and multipurpose passenger vehicles at or below 6,000 pounds GVWR and to certain light trucks with interchangeable parts; a 2005 reconsideration added a two-year phase-in, early exemption-petition processing, and a small-volume exclusion, and NHTSA later denied a request to revise those choices. Parts marking is an anti-theft identification requirement, not proof that a used part is lawful, original, or compatible with a particular vehicle.
Federal Motor Vehicle Safety Standard No. 208 — Automatic Occupant Protection
Required automatic occupant protection, accelerating motorized belts and then airbags before later dual-airbag requirements.
Vehicle Identification Number Requirements
Standardized the 17-character VIN used to identify manufacturer, vehicle attributes, model year, plant, and production sequence. NHTSA revised manufacturer-identifier and related coding rules in 2008 so the 17-character system would retain enough unique VINs for at least another 30 years; it did not lengthen the VIN or create an owner recoding process.
Energy Tax Act Gas Guzzler Tax
Imposed a graduated tax on new passenger cars below specified fuel-economy levels, directly influencing performance-car pricing and engineering.
Clean Air Act Amendments of 1977
Revised mobile-source deadlines and enforcement while reinforcing catalytic-converter, certification, and anti-tampering requirements.
Magnuson-Moss Warranty Act
Standardized written consumer warranties and prohibits tying warranty coverage to branded service or parts except under limited conditions. The FTC's 2015 review retained its disclosure, pre-sale availability, dispute-settlement, interpretation, and warranty-advertising framework.
Energy Policy and Conservation Act
Created Corporate Average Fuel Economy standards, changing fleet mix, vehicle weight, engines, transmissions, and fuel-economy planning from model year 1978 onward.
Control of Lead Additives in Gasoline
Started the gasoline-lead phasedown and enabled catalytic converters and unleaded-fuel vehicles beginning in the 1975 model year.
Motor Vehicle Information and Cost Savings Act
Established federal authority over bumper damage standards, odometer disclosure, and consumer motor-vehicle information; its provisions are now recodified in Title 49.
Clean Air Act Amendments
Created the modern federal motor-vehicle emissions program and required steep reductions in hydrocarbons, carbon monoxide, and nitrogen oxides from new cars.
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