A DUMP TRUCK CAME OFF OF THE HIGHWAY AND MADE AN ILLEGAL TURN IN FRONT OF ME. HE CAUSED A FRONTAL IMPACT ON MY VEHICLE AND THE AIR BAGS DID NOT DEPLOY. I WAS TRAVELING 55 MPH WITH A TRAILER ATTACHED AND SLAMMED ON BRAKES BUT STILL IMPACTED HIM REALLY HARD. I WAS ON THE FEEDER OR FRONTAGE ROAD.