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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. 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. The agency also added a 12th crash to its probe in which a Tesla on Autopilot hit a parked Florida Highway Patrol cruiser Saturday on an inters