A particular area extending in a widthwise direction of a vehicle is established in a lower part of a picture image taken by CCD cameras and the area is divided into six small areas. A first connecting column electrically couples the first shield to a first read pad, and a second connecting column electrically couples the second shield to a second read pad. The shell has a first buckling portion on one side of the shell, and an opening. The drum-striking mechanism includes a striking device which may resemble the drum-striking end of a drumstick, and a drive mechanism, which may include an escapement, e. 03% sulphur is blended, in a minor amount, with an oil of lubricating viscosity, in a major amount, to give a trunk piston marine engine lubricating oil composition for a medium-speed four-stroke compression-ignited marine engine.