I WAS DRIVING A GMC SIERRA 2500 (2015) TRUCK ON A ROAD (SPEED LIMIT 65 MPH) AND WAS STOPPED TO MAKE A LEFT-HAND TURN INTO A STATE PART. A DRIVER HIT ME IN THE REAR AT A HIGH SPEED. THE POWDER FROM THE AIRBAG COMPARTMENTS FILLED THE TRUCK CAP BUT THE AIR BAGS DID NOT DEPLOY.