16. The expert from ETRTO proposed to extend the scope of this UN Regulation to tyres of the speed category, symbol E in order to accommodate the technical evolution of agricultural and forestry vehicles (ECE/TRANS/WP.29/GRBP/2023/9). The expert from Germany expressed concerns over the possible misfitting of tyres on rims, should this proposal be adopted. Some other experts pointed out that they needed more time to study the proposal. Those experts also held the general view that such brand new proposals should first be introduced as an informal document and only later as a working document at the subsequent session, thus giving all experts ample time to study the proposal. Consequently, GRBP decided to postpone the discussion to the next session. In the interim, interested experts were invited to provide their comments and/or questions to ETRTO.

19. GRBP resumed its consideration of the ETRTO proposal to extend the scope of this UN Regulation to tyres of the speed category symbol E in order to accommodate the technical evolution of agricultural and forestry vehicles (ECE/TRANS/WP.29/GRBP/2023/9, GRBP-78-22). GRBP adopted the proposal and requested the secretariat to submit it for consideration and vote at the March 2024 sessions of WP.29 and the Administrative Committee (AC.1) as draft Supplement 21 to UN Regulation No. 106.