148. The representative of the United Kingdom of Great Britain and Northern Ireland, informed AC.3 that GRSP recommended, at its May 2021 session, a proposal for Addendum 1 to Mutual Resolution 1 (M.R.1.) to incorporate drawings, specifications and a manual of the Biomechanical Rear Impact Device (BioRID) test tool. He clarified that the adoption of this amendment at the November 2021 session of AC.3 would facilitate the proper use of UN GTR No. 7 and UN Regulation No. 17 by Contracting Parties of both Agreements. Therefore, he recommended that the representatives of Contracting Parties would be ready to endorse it.