2006 BUICK RENDEZVOUS: OPERATOR STOPPED THE CAR IN PARKING LOT, TURNED OFF THE IGNITION AND REMOVED THE KEYS. CAR WAS IN DRIVE "D" AND KEYS WERE REMOVED. LATER, CAR ROLLED BACKWARD AND HIT ANOTHER CAR IN PARKING LOT (LUCKILY NO ONE WAS INJURED). DEALER INDICATES THAT THE KEYS CANNOT BE REMOVED WHEN CAR IS IN DRIVE. THE RENDEZVOUS SAFETY FEATURE IN THE STEERING WHEEL / IGNITION IS NOT WORKING. *TR