A bumper with an override feature for a vehicle has at least one impact resisting member having at least one bumper beam with a bumper face and at least one override member having at least one override face extending from the bumper beam to increase an effective face area of the bumper beam. In a described embodiment, a valve for use in a subterranean well includes a closure member having open and closed positions. The instructions of an execution set are executed simultaneously. The optical touch system comprises a sensing module for receiving the optical signal and a second processing unit, for calculating relative coordinates of the stylus pen according to the relative movement information included in the optical signal. A target location error is computed with respect to a stored image provided by a target image catalog.