"I had to jump out of the way of a hybrid, which suddenly, and completely silently, moved toward me," said Tom Battle, director of engineering at Symantec, a software company. "The car was a brand new Prius, which I remember because it was still very shiny."
Safety officials such as the police currently do not track accidents whose cause is vehicle silence. In 2003, the National Federation of the Blind, had raised hybrid engine silence as a concern for those visually-impaired.
There is currently no study on this issue by the federal government.