DAUGHTER DRIVING, PASSENGERS/DRIVER HAD ON SEAT BELTS, CLEAR/SUNNY DAY, ANOTHER CAR TAILGATING FAST. STARTED SLOWING TO MAKE LANE CHANGE, CAR SKIDDED, BRAKES LOCKED UP, CAR ROLLED 6 TIMES, CAR UPSIDE DOWN, DRIVER THROWN TO PASSENGER'S SIDE ROOF. SEATBELT DID NOT HOLD. *AK