I HAD MERGED ONTO THE HIGHWAY, TRAVELING AT ABOUT 50 TO 55 MPH ON A VERY NARROW CONSTRUCTION ROAD. I WAS SHARING THIS NARROW ROAD WITH A SEMI AT THIS POINT. AS I TRIED TO GIVE A LITTLE ROOM BETWEEN THE SEMI AND MY VEHICLE, I SUDDEN HIT THE EDGE OF THE ROAD WHERE THERE WERE GRAVELS AND IMMEDIATELY MY VEHICLE STARTED SPINNING OUT OF CONTROL AND ALL OVER THE HIGHWAY, IN AND OUT OF A DITCH AND FINALLY HIT A TREE AND THEN CAME TO A STOP. LUCKILY, I DID NOT SUSTAIN ANY INJURY BUT I AM NOW DEALING WITH MAJOR PAIN IN MY NECK AND BACK THAT IS GETTING WORSE EVERYDAY. MY COMPLAINT IS DURING THIS WHOLE PROCESS THE AIRBAG DID NOT DEPLOY. I WAS HOPING, THIS WITH MUCH IMPACT, THE AIRBAGS SHOULD HAVE DEPLOYED. *TR