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:

1. ECE/TRANS/WP.29/GRSP/2023/24 amended by annex IX to the session report, as draft Supplement 3 to the Original Version and as draft Supplement 4 to the 01 Series of Amendments to UN Regulation No. 135;
2. ECE/TRANS/WP.29/GRSP/2023/19 amended by annex IX, as draft Supplement 2 to the 02 Series of Amendments to UN Regulation No. 135.

35. Under agenda item 7 (see paragraph 22), the expert from OICA introduced GRSP-72-30 to harmonize already existing provisions on hydrogen fuelled vehicles of UN Regulation No. 135 to the provisions of UN GTR No. 13, Amendment 1. GRSP requested its experts to provide feedback on GRSP-72-30 to the expert from OICA before the deadline for submission of official documents for its May 2023 session.