25. The experts from OICA, introduced ECE/TRANS/WP.29/GRSP/2021/12, amended by GRSP-69-22-Rev.2, aiming to allow alternative test methods for heavy duty vehicles in order to improve applicability of the requirements to vehicles of categories M2, M3, N2 and N3. The proposal received comments from the expert of Japan (GRSP-69-31). GRSP adopted ECE/TRANS/WP.29/GRSP/2021/12, as amended by Annex V to the session report. The secretariat was requested to submit the proposal as draft Proposal for Supplement 4 to the original version and Supplement 1 to the 01 series of amendments to UN Regulation No. 134 (Hydrogen and Fuel Cell Vehicles) for consideration and vote at the November 2021 sessions of WP.29 and to the AC.1.