VEHICLE WAS TRAVELING SOUTHBOUND IN THE OUTSIDE LANE OF A 4 LANE HWY. VEHICLE CHANGED LANES ABRUPTLY AND WENT LEFT OF THE CENTER OF ROADWAY ENTERING INTO THE NOURTHBOUND LANES OF TRAFFIC, CONTINUING IN A SOUTHBOUND DIRECTION, THE VEHICLE DEPARTED THE EAST SIDE AND COLLIDED WITH THE END PORTION OF A GUARDRAIL. THE INSIDE PORTION OF THE RIGHT FRONT TIRE CAUGHT THE OUTSIDE OF GAURDRAIL CAUSING THE CAR TO STRADDLE THE TOP OF THE RAIL UNTIL THE UNDERCARRIAGE OF THE CAR CAUGHT ON A POST OF THE RAIL CAUSING THE CAR TO SLIDE SIDEWAYS UNTIL THE LEFT SIDE TIRES DUG INTO THE GROUND AND FLIPPED THE CAR COMPLETELY OVER WHERE IT CONTINUED TO TRAVEL SOUTH, ROLLING OVER AGAIN, COLLIDING WITH A WOOD POST THEN FINALLY COMING TO REST ON IT'S TIRES FACING NORTHWEST. NO AIRBAGS DEPLOYED AT ANY POINT OF THE COLLISION. GEARSHIFT WAS BETWEEN NEUTRAL AND OVERDRIVE. *TR