6. The expert from OICA, Secretary of IWG GTR13, Phase 2, introduced GRSP-73-50-Rev.1 to inform GRSP about editorial changes included in ECE/TRANS/WP.29/2023/81, following decision of GRSP to recommend Amendment 1 to the UN GTR at its December 2022 session. GRSP reconfirmed its agreement to recommend ECE/TRANS/WP.29/2023/81 as Amendment 1 to UN GTR No. 13 for consideration and vote to WP.29 and AC.3 at their June 2023 sessions.

7. GRSP also noted a proposal of corrigendum to Amendment 1 to UN GTR No. 13 for discussion at its December 2023 session, tabled by the IWG Secretary (GRSP-73-26-Rev.1). GRSP agreed to seek endorsement of AC.3 to extend the IWG mandate until December 2023 to complete above proposal of corrigendum. GRSP also noted that if a new replacement proposal was not received by the secretariat, GRSP-73-26-Rev.1 should be confirmed for submission as an official document before the deadline.

8. GRSP considered GRSP-73-23-Rev.1 on methods to shorten the verification test time for the expected on-road performance and performance durability of Compressed Hydrogen Storage Systems. GRSP also noted GRSP-73-38, on the post-crash safety of hydrogen-fuelled heavy-duty vehicles (HDV). It was agreed to resume discussion at the December 2023 session of GRSP as topics for Phase 3 of the UN GTR.