I PARKED MY CAR IN MY DRIVEWAY, LEFT THE CAR RUNNING. DID NOT ENGAGE THE PARKING BRAKE. I WALKED OUT OF THE CAR, INTO MY HOUSE TO PICK UP SOMETHING AND THEN RETURNED TO THE DRIVEWAY. MY CAR WAS NO LONGER IN THE DRIVEWAY, BUT WAS NOW ACROSS THE STREET AND IN MY NEIGHBORS YARD. IT APPARENTLY ROLLED BACKWARDS WHILE IN PARK. I AM VERY CONCERNED THAT THIS MAY HAPPEN AGAIN AND CAUSE INJURY TO SOMEONE. PLEASE LET ME KNOW HOW YOU WANT ME TO PROCEED. I OBVIOUSLY NEED A CAR FOR WORK AND TO CARPOOL, BUT AM NOT SURE IF I SHOULD CONTINUE TO DRIVE IT.