The National Highway Traffic Safety Administration has begun testing vehicles that have cameras in place of real mirrors. The request to test such devices goes back to March of 2014 when the Alliance of Automobile Manufacturers along with Tesla filed a petition with the NHTSA to get approval to install based rear or side vision cameras and screens in their vehicles. Daimler filed a similar petition in 2015 for their heavy duty trucks. Japan and Europe have already approved the technology.
The first car with cameras replacing the side mirrors was the Lexus ES sold in Japan, followed by the Audi e-tron in Europe back in December. Both vehicles are sold in the U.S. with standard mirrors instead of the cameras. Honda's coming Honda e will have the technology standard when it goes on sale in Europe later this year.
Mirrorless systems are an area where the legislation has not yet caught up with the technology according to Mark Dahncke of Audi.