37. As per agenda items 7 and 12 (see paras. 22 and 35), the expert from the OICA introduced GRSP-72-31 to incorporate provisions on hydrogen fuelled vehicles into UN Regulation No. 137 to harmonize this UN Regulation to UN GTR No. 13 Amendment 1. GRSP requested its experts to provide feedback on GRSP-72-31 to the expert from OICA before the deadline for submission of official documents of its May 2023 session.