FILE - This file photo provided by the National Transportation Safety Board via the Florida Highway Patrol shows the Tesla Model S that was being driven by Joshua Brown, who was killed when the Tesla ... more 
FILE - This file photo provided by the National Transportation Safety Board via the Florida Highway Patrol shows the Tesla Model S that was being driven by Joshua Brown, who was killed when the Tesla sedan crashed while in self-driving mode on May 7, 2016. A person familiar with the discussions says Tesla has told Senate committee staffers that its engineers have two main theories about what caused the fatal crash. Both involve the car's cameras and radar. Tesla officials disclosed the theories a briefing with U.S. Senate Commerce Committee staff members Thursday, July 28, 2016, said the person, who didn't want to be identified because the meeting was private. (NTSB via Florida Highway Patrol via AP, File) less 
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Associated Press
Fri, Jul 29, 2016 3:15 PM EDT