24. The expert from CLEPA introduced ECE/TRANS/WP.29/GRSP/2023/38 with a presentation (GRSP-74-36): to reinstate the reference to the one-belt route for installation of boosters (paragraph 6.1.3.4. of the UN Regulation) and to clarify the choice of the dynamic test on a vehicle body shell or on the test bench. The expert from the Netherlands fully supported the proposal which clarified and solved grey areas, so as to provide a full understanding of testing procedure for technical services. GRSP adopted ECE/TRANS/WP.29/GRSP/2023/38 not amended. The secretariat was requested to submit the proposal as draft Supplement 11 to the 03 series of amendments and Supplement 1 to the 04 series of amendments to UN Regulation No. 129 to the June 2024 sessions of WP.29 and AC.1.

27. The expert from France introduced GRSP-74-29-Rev.1, based on a presentation introduced at the May 2023 session of GRSP (GRSP-73-53). She recalled that the proposal would allow installation of a headrest on the bench in the dynamic frontal test of a universal booster cushion with a Q10 dummy. She clarified that this would allow testing of the universal booster cushion, without damaging the neck of the dummy. GRSP adopted GRSP-74-29-Rev.1 as reproduced by annex VI to the report. The secretariat was requested to submit the proposal as part of (paragraph 23) draft Supplement 11 to the 03 Series of amendments and as part of draft Supplement 1 to the 04 Series of Amendments to UN Regulation No. 129 for consideration and vote at the November 2023 sessions of WP.29 and AC.1.