25. GRSP resumed consideration on a proposal (ECE/TRANS/WP.29/GRSP/2020/17) tabled by the expert from the Netherlands aimed at identifying hydrogen-fuelled buses which would be consistent with already existing regulated identification for Liquid Petroleum Gas, Compressed Natural Gas and Liquid Natural Gas fuelled buses. GRSP adopted the proposal not amended and requested the secretariat to submit ECE/TRANS/WP.29/GRSP/2020/17 as draft 01 series of amendments to UN Regulation No. 134, for consideration and vote at the June 2021 sessions of WP.29 and AC.1.

26. The expert from OICA also noted that further discussions on the UN Regulation would be needed to solve a number of inconsistencies concerning heavy-duty vehicles (trucks and buses). GRSP agreed to resume discussion on this subject at its May 2021 session on the basis of a proposal tabled by the expert from OICA.