I WAS STOPPED AT A TRAFFIC LIGHT AND I WAS REAR-ENDED BY A LARGE SUV. MY DRIVER-SIDE SEATBELT UN-SNAPPED AT MOMENT OF IMPACT..MY WIFE WAS IN THE PASSENGER SEAT HER BELT WAS FINE..THE CAR WAS DAMAGED AND EVERYBODY WAS OK...BUT WAS CURIOUS WHY THE SEATBELT UN-SNAPPED.. *TR