89. The expert from the Netherlands on behalf of the GRBP Task Force on Tyre Pressure Monitoring System and Tyre Installation (TF TPMSTI) presented document ECE/TRANS/WP.29/GRSG/2021/30, a proposal for supplement 4 to the 01 series of amendment of UN Regulation No. 121. The experts from Germany, Japan, United Kingdom, Sweden, Italy, France, the European Commission and OICA all supported this proposal.

90. The Chair of GRSG endorsed document ECE/TRANS/WP.29/GRSG/2021/30 and requested its submission to WP.29 and AC.1 for voting at their March 2022 sessions.