VEHICLE WAS HIT BY ANOTHER CAR ON THE FRONT. THE OTHER VEHICLE WAS TRAVELING AT ABOUT 50 TO 60MPH. DRIVER'S SIDE AIRBAG DEPLOYED, AND DRIVER'S SWEAT PANTS CAUGHT ON FIRE. DRIVE RHAD TWO PAIRS OF SWEAT PANTS ON. FIRE BURNED A BIG HOLE THROUGH THE FIRST PAIR, AND SINGED THE SECOND PAIR OF PANTS. IF DRIVE RWOULD NOT HAVE HAD ON TWO PAIRS OF PANTS, HE WOULD HAVE BEEN BURNED. VEHICLE HAS NOT BEEN LOOKED AT BY ANYONE. *AK