Light emitted from light-projecting elements constituted by LEDs or the like is transmitted to a light-projecting optical system of a sensor head portion through an optical fiber cable and projected from the light-projecting optical system onto an object. Initial requests to perform such operations are improved, and such requests are intelligently assessed to appropriately allocate resources to perform operations. The fuel line includes a check valve that prevents the free flow of fluid through the cross feed line when the vehicle is driven across a slope. A transparent conductive layer is arranged over the second semiconductor layer while further a second electrode is disposed over the transparent conductive layer.