PARTICULAR INCIDENT INVOLVED SAID VEHICLE ROLLING BACKWARD DOWN A SUBTLE GRADE AFTER THE OWNER EXITED THE VEHICLE W/KEYS IN HAND. THE VEHICLE SHIFT LEVER WAS ENGAGED IN D (DRIVE) AND THE VEHICLE ENGINE WAS NOT RUNNING. AS A RESULT, VEHICLE IMPACTED ANOTHER CAR INCURRING SIGNIFICANT DAMAGE TO THE REAR OF SAID VEHICLE. WHEN VEHICLE MOTOR IS TURNED OFF, WHILE TRANSMISSION SHIFT LEVER IS ENGAGED IN D (DRIVE), R (REVERSE), 3, OR 1-2 (LOW GEAR) AND IGNITION KEY IS REMOVED, VEHICLE CAN MOVE FREELY FORWARD OR BACKWARD (AS IF IT IS IN NEUTRAL GEAR). FOLLOWING INCIDENT, CONDITIONS LEADING TO THE INCIDENT COULD BE RECREATED AT WILL (VEHICLE ROLLED FREELY WHILE IN GEAR AND ENGINE TURNED OFF). VEHICLE DOES NOT ROLL FREELY WHILE IN P (PARK). *NM