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.