THE VEHICLE WAS IN MOTION ON A CITY STREET. WE WERE TRAVELING APPROXIMATELY 25 MILES AN HOUR THROUGH A GREEN LIGHT WHEN ANOTHER VEHICLE RAN THE RED LIGHT AND HIT US AT APPROXIMATELY 45+ MILES AN HOUR. THE FRONT OF THE VEHICLE WAS SIGNIFICANTLY DAMAGED AND THE DRIVERS AND PASSENGER SIDE AIRBAG WERE DEPLOYED. DURING THIS TIME, THE DRIVERS AND PASSENGERS SEAT BELT LOCKED AS INTENDED. THE PASSENGER SEATBELT FAILED AT THE POINT WHERE THE LAP RESTRAINT ATTACHES TO THE CAR RUNNING BOARD AND WILL NOT RE-ATTACH TO THE VEHICLE AFTER THE ACCIDENT. THE PASSENGER THAT WAS WEARING THE FAILED SEAT BELT DURING THE ACCIDENT WAS 110LBS WHILE THE DRIVER WAS 270LBS. THE DRIVER'S SEATBELT FUNCTIONED AS INTENDED WHILE THE PASSENGERS DETACHED.