windows as the cable that connected the two vehicles exhibited a tensile strength of 8,000 pounds. Once the pull on the cable started, both vehicles would move in precise proportion to one another. After the mock-up launched through the windows, the hook connecting the Mercedes would drop. As Frazier explained, "The hook is very similar to the kind used to launch jets on aircraft carriers, ... Once the hook falls away, the Mercedes is propelled by its own momentum." Aerodynamics played a key role in the execution, as Frazier referred to the stunt saying, "When the car left the building it was very important that it exit and travel flat, ... A lot of times it doesn't matter. In this case, if the car didn't travel flat, you would know that the car could not have survived into the next sequence where it landed on the rooftop. We had to set up aerodynamics on that car, so that every time it went out the window, including the tests, it flew out without the nose dipping down." The explosion filled destruction of the warehouse was produced by 9 separate 18-inch steel mortars on each of the 4 floors. When fully discharged, all 36 mortars produced the largest orchestrated explosion ever allowed in Los Angeles city limits permitted at the time. Another major stunt sequence consisted of a , 21-ton two-tiered automobile carrier flipping over on its side, flinging its automotive cargo onto a freeway of traffic. In the sequence, the carrier is scripted to disconnect from the primary cab at highway speed, so that the carrier veers off to one side while eventually flipping over. Frazier explained how "Clint did not want the car carrier rolling over and over down the freeway, ... He just wanted it to go over on its side and then slide until it stopped. It would have been easier to load that thing up (with cars), get up to speed and 'barrel' roll it down the freeway. But it wouldn't have looked realistic for his character to have survived it." A semi-truck which was trailing 150 feet behind the carrier, held on to it by means of a cable. After the carrier became detached from the passenger cab, the semi-truck came to a stop yanking the carrier from the cab. Frazier demonstrated how gravity played a significant and key role during the scene. He noted, "By