9. As the United States was not represented by an expert, the Chair announced that she was not in a position to present a proposal to solve the study reservation raised by her country at the prior session to the proposed amendment to the UN GTR (ECE/TRANS/WP.29/AC.3/31 and ECE/TRANS/WP.29/GRSP/2012/14). GRSP agreed to resume consideration of this subject at its December 2013 session. It was also agreed to seek guidance to the June 2013 session of the Administrative Committee for the Coordination of Work (WP.29/AC.2) about the possible simultaneous adoption of the two proposed amendments to the UN GTR (Phase 2 and Amendment 2); OICA noted that Amendment 2 needs to apply to both Phase 1 and Phase 2 of the UN GTR.