Prototype hydrogen-fueled cars are now quite complex and the stakes are high. Because the hydrogen is liquefied to a temperature of minus 253 degrees Celsius. Then hydrogen Cait was compressed into high pressure cylinders or tanks, 10,000 psi or 700 bar.
It is not only confusing manufacturer designed the vehicle, but also where hydrogen filling stations. Need expensive and specialized skills to handle it.
Alternatively, composed of hydrogen into electrical energy directly or fuel cell (FC) takes a low-pressure metal hydride canister. The problem, it is difficult to carry.