WAS DRIVING AT APPROXIMATELY 65 MPH WHEN ANOTHER VEHICLE CUT CONSUMER'S OFF AND STOPPED/ DRIVER DODGED VEHICLE/ WENT OVER A DIVIDER/ VEHICLE WAS AIRBORNE, AND FLIPPED TWO AND HALF TIMES, LANDING ON ROOF ON OTHER SIDE OF FREEWAY. SEATBELT WAS WORN,BUT SHOULDER BELT DID NOT LOCK UP, CAUSING CONSUMER'S HEAD TO GO THROUGH WINDSHIELD. CONSUMER WAS AIRLIFTED TO HOSPITAL, AND HAD MAJOR HEAD AND FACE TRAUMA. CONSUMER CONTACTED TOYOTA, AND WILL SEND SOMEONE OUT TO DETERMINE CAUSE. *AK