I WAS GETTING OFF THE FREEWAY AND DRIVING 40 MPH ON THE OFF RAMP, WHEN THE 2001 TOYOTA PRIUS DID A UNWANTED LEFT TURN OF THE STEERING WHEEL, I TRIED TO TURN THE STEERING WHEEL BACK TO CORRECT THE CAR ANGLE, BUT HE STEERING FORCE WAS TOO STRONG FOR ME TO CORRECT BACK TO STRAIGHT AHEAD, THE LEFT FRONT CAR THE CONCRETE BARRIER, AND THE CAR TURN 360 DEGREE AROUND. THE REAR RIGHT BUMPER HIT THE CONCRETE BARRIER. LUCKY THERE WAS NO OTHER CARS AROUND ME.