AOTOMOBILE SKIDDED OF ROAD D/T SNOW/SLUSH STOPPING IN CULVERT. DAMAGE TO FRONT END CONSIDERED SUBSTANTIAL. AIR BAGS DID NOT DEPLOY AND SEAT BELT APPARENTLY DID NOT HOLD OCCUPANT SINCE HER HEAD HIT THE WINDSHIELD. SHE WAS TRANSPORTED TO LOCAL ER. THE FACT THAT THE AIRBAGS DID NOT DEPOLY IMPRESSED THE POLICE AND EMTS AT THE ACCIDENT SITE.*AK