VEHICLE WAS AT A STOP WHEN IT WAS REARENDED & PUSHED INTO A TRUCK IN FRONT IN WHICH IT HIT ANOTHER VEHICLE. UPON IMPACT FROM REAR, SEAT BELTS FAILED TO TIGHTEN UP, AIR BAG ON DRIVER'S SIDE FAILED TO DEPLOY. DRIVER SUFFERED INJURIES TO UPPER & SIDE OF NECK AND SPINE. WAS THROWN AROUND. *AK