12. The expert from ETRTO presented background information on a set of proposals clarifying definitions and making editorial changes in several UN Regulations on tyres (GRBP-81-13-Rev.1). For UN Regulation No. 30, ETRTO tabled draft amendments in ECE/TRANS/WP.29/GRBP/2025/9. GRBP adopted this proposal, as amended by GRBP-81-05-Rev.1 and subject to correcting the new paragraph number to 2.25.3.4.1. and requested the secretariat to submit it for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 27 to the 02 series of amendments to UN Regulation No. 30.

13. The expert from ETRTO introduced draft amendments to clarify several definitions and to make editorial changes (ECE/TRANS/WP.29/GRBP/2025/10). GRBP adopted these proposals, as amended by GRBP-81-06-Rev.1, and requested the secretariat to submit them for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 28 to UN Regulation No. 54.

14. The expert from ETRTO proposed clarifications and corrections (ECE/TRANS/WP.29/GRBP/2025/11). GRBP adopted the proposal, as amended by GRBP-81-07-Rev.1, and requested the secretariat to submit it for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 21 to UN Regulation No. 75.

15. The expert from ETRTO submitted editorial corrections and clarifications to the new 01 series of amendments to UN Regulations Nos. 108 and 109 (ECE/TRANS/WP.29/GRBP/2025/15 and ECE/TRANS/WP.29/GRBP/2025/16). GRBP adopted these proposals, as amended GRBP-81-11-Rev.1 and GRBP-81-12-Rev.1., and requested the secretariat to submit them for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as respectively draft Supplement 1 to the 01 series of amendments to UN Regulation No. 108 and draft Supplement 1 to the 01 series of amendments to UN Regulation No. 109. For draft Supplement 1 to the 01 series of amendments to UN Regulation No. 108, GRBP recalled that the pending correction in ECE/TRANS/WP.29/GRBP/2024/24 should be added.

17. The expert from ETRTO tabled editorial corrections to the 02 and 04 series of amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/GRBP/2025/12 and ECE/TRANS/WP.29/GRBP/2025/13). GRBP adopted these proposals, as amended GRBP-81-08-Rev.1 and GRBP-81-09-Rev.1., and requested the secretariat to submit them for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as respectively draft Supplement 17 to the 02 series of amendments and draft Supplement 3 to the 04 series of amendments to UN Regulation No. 117. For the latter, GRBP agreed to combine it with the amendment proposal to the same series of amendments that was adopted at the previous session (ECE/TRANS/WP.29/GRBP/2024/23 as amended by GRBP-80-11).

21. The expert from ETRTO introduced clarifications and corrections (ECE/TRANS/WP.29/GRBP/2025/14). GRBP adopted the proposal, as amended by GRBP-81-10, and requested the secretariat to submit it for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 2 to the 01 series of amendments to UN Regulation No. 142.