153. The representative of the United Kingdom gave a status report of the work of the IWG on Phase 2 of UN GTR No. 7 on head restraints. He reported that due to the lack of further post mortem subject data, the IWG could not make progress to establish injury criteria. He added that empirical alternatives would be likely explored. Therefore, he intended to work closely with the Chair of the IWG to fix a plan for the future development of the UN GTR and report at the June 2018 AC.3 session.