U.S. questions how Tesla’s Autopilot feature responds to emergency vehicles

The letter is part of a wide-ranging investigation into how the company’s partially automated driving system behaves when first responder vehicles are parked while crews deal with crashes or other hazards.

The agency wants to know how Teslas detect a crash scene, including flashing lights, road flares, reflectorized vests worn by responders, and vehicles parked on the road.

NHTSA also wants to know how the system responds to low light conditions, what actions it takes if emergency vehicles are present, and how it warns drivers.