Federal car security regulators launched a proper investigation into Tesla’s Autopilot system following a collection of crashes which have left at the very least 17 folks injured and 1 useless, in accordance with paperwork posted to the Nationwide Freeway Site visitors Security Administration on Monday.

Autopilot is Tesla’s restricted self-driving characteristic that also requires a human to function. Since January 2018, NHTSA stated it had recognized 11 crashes the place Tesla automobiles have “encountered first responder scenes and subsequently struck a number of automobiles.” The report covers an estimated 765,000 Tesla automobiles throughout fashions constructed between 2014 and 2021.

Tesla shares fell greater than 4% Monday morning following the NHTSA announcement.

The formal investigation comes simply months after the NHTSA and Nationwide Transportation Security Board stated they had been trying into the corporate, following a crash in Texas. In current months there have been a number of probes into Tesla’s Autopilot, together with an investigation in March after a Mannequin Y utilizing the system reportedly struck a stationary police automobile.

“Most incidents passed off after darkish and the crash scenes encountered included scene management measures equivalent to first responder car lights, flares, an illuminated arrow board, and highway cones,” the doc reads. “The concerned topic automobiles had been all confirmed to have been engaged in both Autopilot or Site visitors Conscious Cruise Management in the course of the method to the crashes.”

When engaged, Tesla’s Autopilot system permits drivers to take care of pace and lane centering however doesn’t make the car secure to function with no driver behind the wheel. Drivers are nonetheless accountable for figuring out roadway obstacles and maneuvers from close by automobiles.