TWO CAR COLLISION AT AN INTERSECTION .CITY STREETS. BOTH CARS IN MOTION. AIR BAG DEPLOYED BUT DIDN'T INFLATE. SMOKE FILLED INTERIOR. ATTENDING FIREMAN AT FIRST THOUGHT THE CAR WAS ON FIRE. EXAMINATION SHOWED THAT SMOKE WAS COMING FROM A RUPTURE IN THE AIR BAG NEAR THE POINT WHERE THE BAG WAS CONNECTED TO THE STEERING WHEEL.