| UN R134 Hydrogen Fuel Cell Safety | Hydrogen fuel cell vehicle safety | Uniform provisions concerning the approval of motor vehicles and their components with regard to the safety- related performance of hydrogen-fuelled vehicles UN Regulation version of the HFCV Global Technical Regulation. (For information on the development of this regulation, please see the GTR No. 13: HFCV regulation pages). Hydrogen Fuel Cell Safety Hydrogen fuel cell vehicle safety UN Regulation No. 134 UN R134 | UNR | 134 |