PARKED ON SLIGHT INCLINE IN DRIVEWAY, DID NOT USE PARKING BRAKE, AFTER ABOUT TWO HOURS I CAME BACK AND NOTICED THAT MY VEHICLE HAD ROLLED INTO THE VEHICLE BEHIND ME, A TOTAL DISTANCE OF ABOUT 3 FEET, MY TIRE TRACKS WERE VISIBLE IN THE SNOW, WHICH IS HOW I IDENTIFIED THAT MY VEHICLE ROLLED BACKWARDS AND WAS NOT HIT FROM THE VEHICLE BEHIND MINE. *TR