156. The representative from the United States of America informed that activities on UN GTR No. 21 were idled while the UN GTR on in-vehicle battery durability was developed by the IWG on Electric Vehicle and the Environment (EVE). He added that the IWG resumed activities to take stock of the lessons learned from the application of UN GTR No. 21 by stakeholders to potentially improve and clarify some provisions in the forthcoming months.