135. At the 158th session of the World Forum, a proposal was submitted (ECE/TRANS/WP.29/2012/124 and WP.29-158-19) for a protocol on drawings, calibration and maintenance procedures associated with test tools referenced by UN Regulations and UN GTR in the framework of the 1958 and 1998 Agreements. Finally, WP.29 and AC.3 adopted the M.R.1 (ECE/TRANS/WP.29/2012/124 as amended by WP.29-158-19). 136. At the 160th session of WP.29, the representative of the United Kingdom, on behalf of the Chair of the IWG on UN GTR No. 7, Phase 2, reported on the progress of IWG. AC.3 discussed the way forward:

(a) the measurement of height of head restraint; and then (b) the dynamic test.

AC.3 preferred to proceed in a one-step approach, to consider a complete proposal, including a draft Addendum to M.R.1 and agreed to extend the mandate of the IWG until the end of 2015. 137. At the 166th session of WP.29, the representative of Japan reported on the working progress of the IWG on UN GTR No.7, Phase 2, announcing that the IWG would submit the injury criteria proposal and the pass/fail criteria, at the December 2015 session of GRSP and the final proposal at the May 2016 session of GRSP. AC.3 agreed to extend the mandate of the IWG until December 2016. 138. At the 167th session of WP.29, the representative of Japan reported on the work status of IWG. The group was waiting for output from Post Mortem Human Subjects (PMHS) studies conducted by the National Highway Traffic Safety Administration (NHTSA). This work would help to establish pass/fail criteria. However, while the study performed by NHTSA had provided good data on the reproducibility and repeatability of the BioRID, it was not possible to determine the correlation between the dummy and PMHS. Therefore, more work would be needed to establish statistical significance. He also informed AC.3 that IWG had transmitted an updated draft amendment to the UN GTR to GRSP for discussion at its December 2015 session and that the details of the proposal would be refined before that GRSP session. He added that he expected a final proposal at the May 2016 session of GRSP on UN GTR No. 7 and M.R.1 and that these would be brought to the November 2016 session of WP.29. 139. At the 168th session of WP.29, the representative of the United Kingdom (Chair of AC.3) reported on the work status of IWG. He informed AC.3 that IWG would expect a more advanced proposal at the May 2016 session of GRSP of UN GTR No. 7 and of Addendum 1 to M.R.1 to incorporate BioRID specifications. AC.3 endorsed his request of an extension of the mandate of the IWG until March 2017. 140. At the 170th session of WP.29, the representative of Japan reported on the work progress of IWG. Since the IWG meeting in September 2015, studies on PMHS by NHTSA had not been sufficient to provide data to enable the establishment of suitable injury criteria. The IWG was waiting for further study results on PMHS to be conducted by NHTSA, which were expected by spring 2017. He clarified that these results might help the full incorporation of BioRID into the UN GTR and avoid the adoption of empirical values. He advised that the IWG would provide an update on the progress of work at the March 2017 session of AC.3 to seek consent for a revised timetable for the delivery of the proposed amendment to UN GTR No. 7. 141. At the 171st session of WP.29, the Chair of the IWG on UN GTR No.7, Phase 2 reminded WP.29 that the work to establish injury criteria, based on biomechanical data, had been inconclusive and that the work of the group had now been suspended for approximately eighteen months. It appeared that new data would not be available before the end of 2017 and that a different approach might be necessary. AC.3 extended the mandate of the IWG until June 2018. 142. At the 172nd session of WP.29, the representative of the United Kingdom on behalf of the Chair of IWG, reported that IWG had been unable to establish injury criteria directly from PMHS testing but that they had developed some understanding