144. The expert from the United States of America, in his capacity as Chair of the IWG on Quiet Road Transport Vehicle GTR (QRTV GTR), recalled his statement at the previous session of AC.3 about the Final Rule, the Federal Motor Vehicle Safety Standard (FMVSS) on Minimum Sound Requirements for Hybrid and Electric Vehicles becoming effective. He reported that the Final Rule had become effective on 5 September 2017. He indicated that the role of the GTR of IWG on QRTV was to harmonize the corresponding FMVSS and UN Regulation. He informed AC.3 that the initial assessment of the IWG was that the two regulations were not significantly unsimilar, and that a meeting in cooperation with GRB would be convened in the near future to assess the exact differences between the two regulatory texts, including all relevant amendments to the UN Regulation and NHTSA documents. The meeting time would be announced upon coordination with the GRB Chair, with the aim to hold it before the WP.29 March 2018 session.