Washington, D.C. — The White House Office of Management and Budget approved the final rule on automatic emergency braking for light vehicles on April 22, 2024, clearing the path for the National Highway Traffic Safety Administration to publish the regulation shortly thereafter.

The move follows a year of research that estimates the new law could save 360 lives each year and cut injuries by 24,000. The AEB technology requires a vehicle to detect a collision risk and apply brakes automatically, a feature that has already become standard in many foreign cars but was missing from most U.S. models until now.

OMB reviewed the proposal in January and found the benefits far outweighed the costs. If the rule is adopted as written, nearly every new vehicle weighing under 10,000 pounds will need to include AEB technology within three years of publication in the Federal Register. The deadline is built into the final text to keep manufacturers on schedule.

Heavy‑vehicle rules still await OMB approval. NHTSA and the Federal Motor Carrier Safety Administration issued a joint proposal last June that would require electronic stability control and AEB on Class 7 and 8 trucks within three years of enactment, and on Class 3 to 6 trucks within four years. The proposal calls for AEB on vehicles weighing 10,001 pounds or more, a category that includes most tractor‑trailer rigs. The Department of Transportation had projected a final rule in April, but the OMB review is expected to take several months.

Reports of false activations have surfaced for both light and heavy vehicles. An Associated Press investigation uncovered unexpected braking in almost three million Hondas, with 47 crash reports and 112 injury reports linked to the issue. Truck drivers have also voiced complaints. Carrie Moore, a professional driver, recounted a 2022 incident on a snowy Michigan highway where a guardrail triggered a false AEB, causing her Class 8 truck to jackknife on ice. She said the system applied full braking and sent her sideways, nearly into the median. NHTSA opened a probe in May 2023 into false braking on specific Freightliner models, after 18 complaints that AEB engaged without a real obstacle and stopped the truck in the travel lane.

What This Means for Drivers

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