US Patent 7385488 Rear warning system employing outside mirror in vehicle

Disclosed is a rear warning system employing an outside mirror of a vehicle. When a driver moves a vehicle backward and parks the vehicle, the rear warning system warns a driver that the vehicle approaches a person or an obstacle existing behind the vehicle and provides the driver with a visual indication of the distance between the rear end of the vehicle and the person or the obstacle, so that a vehicular collision can be prevented and the vehicle can be stopped or parked at an exact distance, thereby enhancing the convenience in driving the vehicle.