THE CAR WAS REAR ENDED AT A FAST SPEED AS IT WAS PROCEEDING AT A SLOW PACE AS TRAFFIC WAS STARTING TO TAKE OFF FROM BEING AT A STAND STILL. THE PERSON DRIVING WAS SLAMMED INTO THE STEERING WHEEL AT THE SAME TIME THE SEAT BELT FLEW OFF AND THE BUCKLE STRUCK THE DRIVER ON THE ARM CAUSING INJURY THE SEATBELT WOULD NOT RETRACT BACK INTO PLACE AND ALSO THE DRIVER'S KNEE HIT THE STEERING CAUSING THE KEY TO BREAK OFF INTO THE IGNITION CAUSING INJURY TO THE KNEE AND LEG. THE CAR ACCIDENT HAPPENED ON THE TOP OF THE BRIDGE LEADING TO THE HIGHWAY. THE CAR WAS MOVING AT A SLOW PACE BECAUSE TRAFFIC HAD STOPPED THEN PROCEEDED TO GO. IT DIDN'T HAVE A CHANCE TO GO FULL SPEED BEFORE BEING STRUCK. I BELIEVE THE FORCE OF THE IMPACT CAUSED THE SEATBELT TO MALFUNCTION I DON'T KNOW WHY THE AIR BAG DIDN'T DEPLOY.