But EPA chief would be open to a deal between California, automakers.
Department Of Transportation
At higher speeds, tire noise, wind resistance, and other factors eliminate the need for a separate alert sound, regulators say.
EPA is asking the public for comments on Obama-era policy.
Some cars already have this safety device.
The topic has rare "good bipartisan agreement."
The US Department of Energy chooses the 10 sites, including two in California and others in Michigan, Iowa and Pennsylvania, where testing of autonomous vehicles can take place.
The organization believes the technology has the potential to prevent hundreds of thousands of crashes.
Chao was the first Asian-American woman to hold a Cabinet job.
Company told to cease transport operations until multiple issues are addressed.
Ford, Google, Lyft, Uber and Volvo form an organization to better prepare America's roads for self-driving technology.
The collision-avoidance system could warn bus drivers of pedestrians and bicyclists. It could also help city planners prevent crashes before they happen.
The DOT's new safety rules would add more crash tests, evaluate pedestrian safety in an accident, and check for the latest safety tech in vehicles. While still just a proposal, the updates could arrive for the 2019 model year.
Takata has been fined $70M by the US Department of Transportation, and Honda drops and publicly denounces the airbag supplier. Autoblog's Adam Morath reports on this edition of Autoblog Minute.
Independent researchers have uncovered major cyber-security weaknesses and emissions scams, but the government agencies that benefit most don't appreciate the help.
US DOT may build the world's largest hydrogen refueling station in the City by the Bay.
Low gas prices mean that US drivers put more miles on their cars in 2015 than ever before. 987.8 billion miles in the first four months, to be exact.