A fender assembly is divided into an upper fender and a lower fender with a air guide port being formed in the upper fender wherein the entry of muddy water splashed up in a tangential line direction by a front wheel into the air guide port is prevented and the size of the upper fender is reduced. The compressor and storage tanks deliver the high-pressure working air and operational flows to several stages of compressors that boost the pressures during driving to very high-pressure, then ultra high-pressure, then super high-pressure, and finally to extremely high-pressure. The first electrodes are connected to each other and the second electrodes are connected to each other in a first direction.