UPON DEPLOYMENT THE AIRBAG COVER SPILT DOWN THE MIDDLE AND DID NOT FULLY DEPLOY DURING IMPACT WITH ANOTHER VEHICLE. THIS OCCURRED ON THE HIGHWAY, I WAS CUT OFF AND THE OTHER VEHICLE CAME TO A FULL HARD STOP IN FRONT OF ME, DESPITE APPLYING MAXIMUM BREAKING FORCE, I HAD NO DISTANCE TO STOP AND REAR ENDED THE OTHER VEHICLE.