18. The expert from the United States of America introduced GRSP-51-21, reflecting the last changes proposed by the special informal working group safety (SGS) to the main text of the draft UN GTR (ECE/TRANS/WP.29/GRSP/2012/12 superseding ECE/TRANS/WP.29/GRSP/2011/33). The expert from OICA introduced GRSP-51-05 proposing to delete of the square brackets from the provisions on the physical protection from high voltage. The proposals received some comments from the expert from Japan that mainly focused on the tolerances of the hydrogen container pressure (GRSP-51-21-Rev.1). The experts from Japan and EC urged the adoption of the draft UN GTR. The expert from EC indicated that a comparative analysis of the European legislation on hydrogen powered vehicles (i.e.: Regulations (EC) No. 79/2009 and (EU) No. 406/2010) against the draft UN GTR was available.

19. However, GRSP agreed to defer the adoption of the draft UN GTR to its December 2012 session to give more time for discussion to SGS experts concerning the last changes introduced and the physical protection from high voltage. Experts were invited to provide comments on the proposal (GRSP-51-21-Rev.1 and ECE/TRANS/WP.29/GRSP/2012/12) to the expert of the United States of America, before the deadline for submission of official documents to the December 2012 session of GRSP (see para. 49). In the mean time it was agreed to seek the consent of WP.29 and AC.3 at their June 2012 sessions to extend the mandate of the SGS group until December 2012.

14. The expert from the United States of America introduced draft UN GTR on safety of hydrogen and fuel cell vehicles (ECE/TRANS/WP.29/GRSP/2011/33) prepared by the special group safety (SGS). The proposal received some comments such as a better defining of the scope. GRSP noted that more time was needed by the SGS group to gather comments and finalize the proposal. Accordingly, GRSP agreed to seek consent for a six months extension of the mandate of the informal working group at the March 2012 sessions of WP.29 and AC.3, expecting the submission of a revised proposal for final review at the May 2012 session of GRSP. Experts were invited to provide comments on the proposal (GRSP-50-19-Rev.1 superseding ECE/TRANS/WP.29/GRSP/2011/33) to the expert of the United States of America, before the deadline for submission of official documents to the May 2012 session of GRSP.

15. Finally, the Chair of GRSP recalled the recommendation made during the December 2010 session of GRSP (see ECE/TRANS/WP.29/GRSP/48, para. 37) to all the Chairs of the informal working groups to ensure traceability of expert mandates for their participation in the meetings.