21. GRSP considered GRSP-69-09, concerning the interpretation of the expert from the Netherlands on the way “one belt route” defined by the current text of UN Regulation No. 129 (Enhanced Child Restraint Systems). He also requested guidance to GRSP how to deal in the future with questions of this kind. GRSP agreed on the interpretation provided by the expert from the Netherlands:

""one belt route" shall be strictly interpreted, only asymmetrical attachments can still be regarded as “one belt route”

GRSP agreed that such an interpretation would not need to amend the current text of UN Regulation No. 129. Moreover, GRSP agreed that such decision would be reported orally by the Chair of GRSP at the June 2021 session of WP.29 as well as the request of guidance to address issue of interpretations of this kind in a more coordinated way in the work of WP.29 and its subsidiary bodies.

22. GRSP also adopted: ECE/TRANS/WP.29/GRSP/2021/3, ECE/TRANS/WP.29/GRSP/2021/4, ECE/TRANS/WP.29/GRSP/2021/5 and ECE/TRANS/WP.29/GRSP/2021/6, all not amended, clarifying the application of the dynamic tests procedures to ECRS. The secretariat was requested to submit the proposals, for consideration and vote at the November session of WP.29 and AC.1, for consideration and vote at the June 2021 session of WP.29 and to the AC.1, as draft:
(a) Supplement 11 to the original version of UN Regulation No. 129. (ECE/TRANS/WP.29/GRSP/2021/3);
(b) Supplement 8 to the 01 series of amendment to UN Regulation No. 129 (ECE/TRANS/WP.29/GRSP/2021/4);
(c) Supplement 7 to the 02 series of amendment to UN Regulation No. 129 (ECE/TRANS/WP.29/GRSP/2021/5);
(d) Supplement 6 to the 03 series of amendment to UN Regulation No. 129 (ECE/TRANS/WP.29/GRSP/2021/6). In the same time GRSP clarified that built-in ECRS are defined into the UN Regulation No. 129 since to 03 series of amendments to the UN Regulation.

23. The expert from Spain, introduced ECE/TRANS/WP.29/GRSP/2021/7 to clarify how to assess the head containment and in addition to increase the time frame for its assessment. The expert from EC requested a study reservation on the proposal. GRSP agreed to resume discussion on this subject at its December 2021 session.

24. Finally, the expert from Japan introduced GRSP-69-25 to inform GRSP on results from tests performed in his country concerning frontal impact using the Q1.5 dummy and four types of ECRS type approved according to the UN Regulation and focusing on the effect of contact between the chin and chest on the dummy’s neck injury. The expert from Spain volunteered to cooperate with the expert from Japan on this issue and provide together an update at the December 2021 session of GRSP. In the same time the expert from Spain withdrew GRSP-68-13.