44. As per paragraphs 23, 25, 38 and 40, the expert from OICA introduced GRSP-73-31 (superseding ECE/TRANS/WP.29/GRSP/2023/21) to incorporate provisions on hydrogen-fuelled vehicles into UN Regulation No. 153. GRSP adopted ECE/TRANS/WP.29/GRSP/2023/21 as amended by annex XII to the session report. The secretariat was requested to submit the proposal as draft Supplement 4 to the Original Version of UN Regulation No. 153, for consideration and vote at the November 2023 sessions of WP.29 and AC.1.

41. Under agenda items 7, 12 and 14 (see paragraphs 22, 35 and 37), the expert from OICA introduced GRSP-72-32 to harmonize already existing provisions on hydrogen fuelled vehicles of UN Regulation No. 153 to the provisions of UN GTR No. 13, Amendment 1. GRSP requested its experts to provide feedback on GRSP-72-32 to the expert from OICA before the deadline for submission of official documents for its May 2023 session.