Data / Federal rules / 2024-27349

Federal Motor Vehicle Safety Standards; Automatic Emergency Braking Systems for Light Vehicles

The National Highway Traffic Safety Administration published this final rule in the Federal Register on November 26, 2024. It took effect on January 27, 2025.

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What the agency says

This document grants parts of petitions for reconsideration of a May 9, 2024, final rule that adopted Federal Motor Vehicle Safety Standard (FMVSS) No. 127, "Automatic Emergency Braking for Light Vehicles," which requires automatic emergency braking (AEB), pedestrian automatic emergency braking (PAEB), and forward collision warning (FCW) systems on all new light vehicles. This final rule clarifies requirements applicable to FCW visual signals and audio signals, corrects an error in the test scenario for obstructed pedestrian crossing the road, and removes superfluous language from the performance test requirement for lead vehicle AEB. This notice denies other requests in the petitions. This document also denies a petition for reconsideration, which is treated as a petition for rulemaking because it was received more than 45 days after publication of the rule.

Key facts

Document number: 2024-27349
Type: Final rule
Action: Final rule; response to petitions for reconsideration
Agency: Transportation Department; National Highway Traffic Safety Administration
Published: November 26, 2024
Takes effect: January 27, 2025
Dates: Effective: January 27, 2025.
Docket: Docket No. NHTSA-2023-0021
Regulation ID (RIN): 2127-AM37
Code of Federal Regulations: 49 CFR 571
Topics: Motor vehicle safety; Motor vehicles; Rubber and rubber products
Pages: 22

The document on federalregister.gov PDF

Other documents from the National Highway Traffic Safety Administration

Document	Type	Published
Part 572; Anthropomorphic Test Devices; Test Device for Human Occupant Restraint 50th Percentile Adult Male Dummy (THOR-50M); Extension of Comment Period 2026-21730	Proposed rule	Oct 23
Eliminating Obsolete Regulations Related to the 911 Grant Program 2026-20493	Final rule	Oct 6
The Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule III for Model Years 2022 to 2031 Passenger Cars and Light Trucks 2026-19964 · significant	Final rule	Sep 30
Amendment to the Uniform Procedures for State Highway Safety Grant Programs 2026-19403	Final rule	Sep 23
Part 572; Anthropomorphic Test Devices; Test Device for Human Occupant Restraint 50th Percentile Adult Male Dummy (THOR-50M) 2026-19370	Proposed rule	Sep 22
Federal Motor Vehicle Safety Standards; Denial of a Petition for Rulemaking 2026-19242	Proposed rule	Sep 21
Federal Motor Vehicle Safety Standard No. 213a; Child Restraint Systems-Side Impact Protection; Federal Motor Vehicle Safety Standard No. 213; Child Restraint Systems, Federal Motor Vehicle Safety Standard No. 213b; Child Restraint Systems; Incorporation by Reference 2026-18380	Final rule	Sep 9
Resetting NHTSA's Fuel Economy Program: Commercial Medium- and Heavy-Duty On-Highway Vehicles and Work Trucks 2026-17756	Final rule	Aug 31

Everything from the National Highway Traffic Safety Administration · Rules on motor vehicle safety · Rules on motor vehicles · Rules on rubber and rubber products · Published in November 2024

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.