156. The representative of the United States of America, informed AC.3 about the last meeting held by the IWG Phase 2 in his country in February 2018. He informed AC.3 that the group was addressing a number of research items such as material compatibility, performance-based test for long-term stress rupture and potential revision of the scope to address additional vehicle classes (heavy-duty vehicles and buses). He added that due to the complexity of the work the IWG had decided to create five task forces, each of them addressing a specific issue. He announced that complete terms of reference would be submitted to GRSP for a first endorsement of the group and then submitted to the June 2018 session of AC.3.