A vehicle can be quiet for its occupants and difficult to detect for someone walking nearby. NHTSA's December 14, 2016 final rule addresses that second experience, especially for blind and visually impaired pedestrians. It establishes minimum sound requirements for covered electric vehicles and hybrids capable of moving in normal travel without their combustion engine operating. [2016-28804][2013-00359]

The agency's January 2013 proposal had already treated recognizable vehicle sound as a safety issue. It proposed broader coverage, including medium and heavy trucks and motorcycles. The final standard instead covers specified passenger cars, multipurpose vehicles, trucks and buses at or below 10,000 pounds gross vehicle weight rating, plus low-speed vehicles. Qualifying light buses remain included; buses were not excluded as a whole. [2016-28804][2013-00359]

For people relying on audible traffic cues, that boundary matters as much as the announcement. The adopted standard is a requirement for a defined set of vehicles, not a claim that every quiet vehicle on a street will immediately become easier to hear. The original rule separated its February 13, 2017 effective date from initial compliance on September 1, 2018 and full compliance on September 1, 2019. [2016-28804][2013-00359]

Putting pedestrian detection into vehicle design recognizes a cost borne outside the car. That is the public-interest significance of the mechanism, not evidence of injuries already prevented. The proposal and final rule document one NHTSA process. They explain the intended protection and its limits, while leaving actual safety results to evidence beyond these publications. [2016-28804][2013-00359]

Source documents

  1. Federal Motor Vehicle Safety Standards; Minimum Sound Requirements for Hybrid and Electric Vehicleshttps://www.govinfo.gov/content/pkg/FR-2016-12-14/html/2016-28804.htm
  2. Federal Motor Vehicle Safety Standards; Minimum Sound Requirements for Hybrid and Electric Vehicleshttps://www.govinfo.gov/content/pkg/FR-2013-01-14/html/2013-00359.htm