This informal working group has been established to further develop GTR No. 13, including consideration of the following:
- harmonization of crash test specifications,
- revision of the scope to address additional vehicle categories,
- refinement of test procedures and correction of errors,
- material compatibility and hydrogen embrittlement,
- evaluation of performance test and stress rupture proposed in Phase 1,
- electric barrier enclosure and
- consideration of research results reported after completion of Phase 1.