VEHICLE STRUCK FROM REAR BY FULL-SIZE PICKUP WHILE STOPPED AT INTERSECTION. ESTIMATED IMPACT SPEED 55MPH. BOTH FRONT DRIVER AND FRONT PASSENGER SEATS COLLAPSED, WITH THE FRONT PASSENGER SEAT LANDING ON CHILD SEAT IN REAR, AND FRONT DRIVER SEAT COLLAPSING COMPLETELY. DRIVER AND PASSENGER SUSTAINED BACK, NECK AND SHOULDER INJURIES. *TR