Tesla fatal crash: 'autopilot' mode sped up car before driver killed, report finds

Findings about crash in Silicon Valley raise fresh concerns about limits of Elon Musk's technology

A Tesla driving in "autopilot" mode crashed in March when the vehicle sped up and steered into a concrete barrier, according to a new report on the fatal collision, raising fresh concerns about Elon Musk's technology.

The National Transportation Safety Board (NTSB) said that four seconds before the 23 March crash on a highway in Silicon Valley, which killed Walter Huang, 38, the car stopped following the path of a vehicle in front of it. Three seconds before the impact, it sped up from 62mph to 70.8mph, and the car did not brake or steer away, the NTSB said.