# Federal Motor Vehicle Safety Standards; Automatic Emergency Braking Systems for Light Vehicles
> **National Highway Traffic Safety Administration** · Final rule; delay of effective date. · Published 2025-01-27 · Effective 2025-03-20 · 90 FR 8179
## Document
- **Document number:** 2025-01832
- **Category:** fmvss
- **Sub-agency:** National Highway Traffic Safety Administration
- **Federal Register citation:** 90 FR 8179
- **CFR reference:** 49 CFR 571
- **Publication date:** 2025-01-27
- **Effective date:** 2025-03-20
- **DOT docket:** Docket No. NHTSA-2023-0021
## Abstract

This document delays the effective date of the November 26, 2024 final rule partially granting 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/01/27/2025-01832/federal-motor-vehicle-safety-standards-automatic-emergency-braking-systems-for-light-vehicles)
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