38. As per paragraphs 23 and 25, GRSP resumed discussion on two revised proposals (ECE/TRANS/WP.29/GRSP/2023/19, amended by GRSP-73-33 and ECE/TRANS/WP.29/GRSP/2023/24, amended by GRSP-73-32) tabled by the expert from OICA to harmonize already existing provisions on hydrogen-fuelled vehicles in UN Regulation No. 135. GRSP adopted: