WAS DRIVING CAR AND WINDSHIELD BEGAN TO FREEZE OVER WITH FROST. CAME TO COMPLETE STOP IN RESIDENTIAL STREET, AND THE CAR WAS STATIONARY. I THEN PRESSED PARK BUTTON AND OPENED CAR DOOR TO GET OUT TO SCRAPE WINDSHIELD MORE. CAR DID NOT GO INTO PARK AND BEGAN TO ROLL, PULLING ME OUT AND TO THE GROUND AND AND MY LEFT LOWER LEG WAS RAN OVER BY LEFT REAR TIRE. CAR CONTINUED TO ROLL AND WENT OFF ROAD AND CRASHED INTO A TREE. IN THE OWNER'S MANUAL FOR VEHICLE, MANUAL STATES THAT "PARK POSITION P IS AUTOMATICALLY ENGAGED IF: *YOU SWITCH OFF THE ENGINE USING THE KEY AND REMOVE THE KEY OR *YOU OPEN THE DRIVER'S DOOR WHEN THE VEHICLE IS STATIONARY OR DRIVING AT A VERY LOW SPEED AND THE TRANSMISSION IS IN POSITION D (DRIVE) OR R (REVERSE). FROM THE OWNER'S MANUAL, THE VEHICLE SHOULD HAVE WENT INTO PARK AND NOT ROLLED.