US asks Tesla how Autopilot responds to emergency vehicles

The U.S. government’s highway safety agency wants detailed information on how Tesla’s Autopilot system detects and responds to emergency vehicles parked on highways.

The National Highway Traffic Safety Administration made the detailed request in an 11-page letter sent to the electric car maker that was dated Tuesday.

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.