When 36-year-old Jesus Armando Escobar was exiting off Interstate 4 onto State Road 528, he had no idea what was about to happen on the overpass above him. Antonio Santiago Wharton, 33, of Kissimmee, was driving a Mack truck loaded down with scrap metal at about 7:35 a.m. Saturday. As he negotiated the curve, he lost control of the truck, hit the guardrail and overturned the vehicle, the Florida Highway Patrol said. A 7,000 pound metal pipe flew off Wharton’s truck, tumbled off the overpass and landed squarely on the roof of Escobar’s Pontiac Van.