Assistance in Parking a Vehicle Between Front and Rear Objects

A method for assisting in parking a vehicle in a parking space between front and rear objects includes determining a length of the parking space and the location of the vehicle relative to the parking space from signals produced by sensors located on the vehicle, determining a first distance between a rear surface of the vehicle and the rear object from a signal produced by a distance sensor on the vehicle directed rearward toward the rear object or the vehicle location estimation relative to the rear object, determining a second distance between a front surface of the vehicle and the front object from the current first distance and the length of the parking space or the vehicle location estimation relative to the front object, and warning the vehicle operator to change between forward and reverse drive when the first and second distances become equal to or less than a reference distance from a respective one of the objects.