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.

25. The expert from CLEPA introduced GRSP-74-03 that sets strict design requirements to reduce misuse of type-approved Child Restraint Systems (CRS) already on market that had features that were not allowed by UN Regulation No. 129. He requested feedback from the experts on what can and should be done. The expert from Finland informed GRSP that when a situation of this kind occurred in his country, market surveillance intervened to withdraw the product from the market. GRSP agreed to keep GRSP-74-03 on the agenda of the May 2024 session of GRSP for further consideration.

26. The expert from the Netherlands introduced GRSP-74-10 which requests guidance on Supplement 10 to the 03 series to UN Regulation No. 129 (ECE/TRANS/WP.29/2023/120). He explained that the proposal had been adopted by WP.29 at its November 2023 session to clarify the existing requirement on “one-belt route”. He recalled to GRSP that the proposal aimed for a better understanding of Type Approval Authorities to guarantee a prevention of misuse by end-users of the product. He added that introducing clarification through the supplement would lead to uncertainty on previous type approvals granted in the same series of amendments but based on different interpretations. He added that the same uncertainty would be reiterated for extensions of these type approvals preceding the supplement. He therefore requested experts to provide feedback for discussion to Type Approval Authority Meetings (TAAM). The expert from CLEPA confirmed the relevance of this issue for GRSP. GRSP recommended its experts to be increasingly vigilant on this type of matters. The Chair of GRSP was requested to highlight this issue in his intervention at the March 2024 session of WP.29.

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.