19. The experts from GTB proposed clarifying the duration of the optical indication of the answer-back signal (ECE/TRANS/WP.29/GRE/2025/7). GRE adopted the proposal and requested the secretariat to submit it for consideration and adoption to the November 2025 sessions of WP.29 and AC.1 as part of draft Supplement 2 to the 09 series of amendments to UN Regulation No. 48.