Lights flashing and siren blaring, the ambulance stopped at a red light, checking for traffic. The firefighter at the wheel eased forward. Halfway through the intersection, his partner saw the truck.
“I said, ‘This is going to hurt,’ ” Montgomery County firefighter Robert Sito, 27, told accident investigators later that day at Suburban Hospital in Bethesda. Engine 723, headed to the same call for a hazardous material spill, was coming their way at an estimated 44 mph.