VEHICLE WAS STRUCK FROM BEHIND BY A PICK-UP TRUCK DRIVING AT A HIGH RATE OF SPEED. UPON IMPACT MY VEHICLE'S FRONT SEATS COLLAPSED INTO THE BACK SEATS CAUSING THE SEAT BELTS TO BE INEFFECTIVE. AS A RESULT THE PASSENGER IN MY VEHICLE SUSTAINED BACK AND NECK INJURIES. MY VEHICLE WAS STATIONARY AS THE TRAFFIC WAS AT A STANDSTILL. THE VEHICLE THAT STRUCK MY VEHICLE WAS TRAVELING AT ABOUT 70 MILES PER HOUR.