93. The representative of the United States of America, on behalf of the co-sponsors, provided an oral report on this matter. He informed AC.3 that his country had begun the process of transposing the UN GTR and that a Notice of Proposed Rulemaking (NPRM) was expected in 2015. He clarified that his country and the co-sponsors (Germany and Japan) were expected to submit draft terms of references (ToR) to the May 2014 session of GRSP and to the June 2014 session of AC.3 on Phase 2 of the UN GTR. He also anticipated that topics for Phase 2 would include: (i) potential harmonization of crash test specifications, (ii) potential scope revision to address additional vehicle categories, (iii) refinement of test procedures and correction of errors, (iv) material compatibility and hydrogen embrittlement, (v) evaluation of performance test and stress rupture proposed in Phase 1, (vi) electric barrier enclosure and (vii) consideration of research results reported after completion of Phase 1. AC.3 agreed that due to the complexity of the proposed Phase 2, a proposal of authorization to develop it, including the ToR and a new IWG mandate would be submitted as soon as possible to GRSP and AC.3.