THE VEHICLE WAS INVOLVED IN A HIGH-SPEED CRASH ON I-35 IN DENTON TX. THE CAR WAS REAR-ENDED. BOTH CARS WERE TRAVELLING AT HIGHWAY SPEEDS (50-60 MPH). THE DRIVER AND THE FRONT SEAT PASSENGERS WERE RESTRAINED AND BOTH SUSTAINED HEAD INJURIES AND LOST CONSCIOUSNESS. THEY WERE TAKEN FROM THE SCENE IN AN AMBULANCE. THE AIRBAGS DID NOT DEPLOY AND WE ARE CONCERNED THAT THEY SHOULD HAVE.