DT: CONTACT STATES WHILE DRIVING VEHICLE ON THE INTERSTATE AT 60 MPH THE TREAD SEPARATED FROM THE TIRE. THIS, IN TURN, CAUSED THE VEHICLE TO LOSE CONTROL. THE VEHICLE BOUNCED BACK AND FORTH, SENDING THE OCCUPANTS FROM SIDE TO SIDE, UP AND DOWN, ALMOST CAUSING THE VEHICLE TO OVER TURN. WHEN THE VEHICLE STOPPED IT HIT THE PAVEMENT , CAUSING EXTENSIVE DAMAGE TO THE VEHICLE. THERE WAS NO VIBRATION IN THE VEHICLE OR THE TIRES PRIOR TO THIS INCIDENT. THE TIRE WAS LOCATED ON THE BACK DRIVER'S SIDE. INJURIES WERE SUSTAINED. NO POLICE REPORT TAKEN.*AK