FOREMAN PULLED UP & PARKED IN FRONT OF HAUL TRUCK #464 WHICH WAS WAITING TO BE LOADED. THE FORE MAN MADE A HAND MOTION TO THE DRIVER TO COME DOWN. WHILE WAITING HE NOTICED TRUCK ROLLING TOWARD VEHICLE W/DRIVER ON THE CAB PLATFORM. THE INJURED JUMPED FROM PASSENGER SIDE BEFORE IMPACT. HE GOT PUSHED UNDER THE VEHICLE & POSITIONED HIS BODY IN CENTER OF HAUL TRUCK AS IT PASSED OVER HIM