WAS HIT IN THE REAR END ON THE HIGHWAY, I WAS MOVING PROBABLY 8-10 MPH THROUGH A DEBRIS FIELD FROM AN ACCIDENT. THE CAR DID NOT SLOW AND HIT ME PROBABLY AROUND 35-40 MPH. MY AIRBAGS DID NOT FIRE SINCE IN A REAR END IMPACT THEY SHOULD NOT TRIGGER. I DID NOT IMPACT THE CAR IN FRONT OF ME. MY HEAD HIT THE HEADREST IN MY FIRST MOTION THEN IT HIT THE STEERING WHEEL LEAVING ME WITH A CONCUSSION. MY ISSUE SHOULDN'T THE SEAT BELT HAVE LOCKED AND RESTRAINED ME IN THAT SECONDARY IMPACT MOTION?