Car was parked on street with a slight downward slope behind it. It was turned off and placed in "Park". It rolled backwards down the street and hit a utility pole which caused it to stop. After seeing that it had "moved on its own" the shift handle was checked and still indicated the car was in "Park". Suspect some issue with the car actually being in park related to transmission, shift lever, or Ignition. The ignition has periodically displayed a reluctance to allow the car to start when the key is turned. The car will go to Ford dealer since I understand there was a large recall for this issue.