NTSB: Autopilot Flaw, Driver Inattention Caused Tesla Crash

A design flaw in Tesla’s Autopilot semiautonomous driving system and driver inattention combined to cause a Model S electric car to slam into a firetruck parked along a California freeway, a government investigation has found.

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The National Transportation Safety Board determined that the driver was overly reliant on the system and that Autopilot’s design let him disengage from driving.

The agency released a brief report that outlined the probable cause of the January 2018 crash in the high occupancy vehicle lane of Interstate 405 in Culver City near Los Angeles.

The findings raise questions about the effectiveness of Autopilot, which was engaged but failed to brake in the Culver City crash and three others in which drivers were killed since 2016.

No one was hurt in the I-405 crash involving a 2014 Tesla Model S that was traveling 31 mph at the time of impact, according to the report. The crash occurred after a larger vehicle ahead of the Tesla, which the driver described as an SUV or pickup truck, moved out of its lane and Tesla hit the truck that had been parked with its emergency lights flashing while firefighters handled a different crash.

The probable cause of the rear-end crash was the driver’s lack of response to the firetruck “due to inattention and overreliance on the vehicle’s advanced driver assistance system; the Tesla Autopilot design, which permitted the driver to disengage from the driving task, and the driver’s use of the system in ways inconsistent with guidance and warnings from the manufacturer,” the NTSB wrote in the report.

Tesla has said repeatedly that the semi-autonomous system is designed to assist drivers, who must pay attention and be ready to intervene at all times. The company says Teslas with Autopilot are safer than vehicles without it, and that the system does not prevent all crashes.