25. The expert from the Kingdom of the Netherlands introduced ECE/TRANS/WP.29/GRSP/2025/4 with a proposal to extend the definition of a module, which had already been discussed in the previous session based on an informal document (see paragraph 29 of ECE/TRANS/WP.29/GRSP/76).

26. Taking also into account the previous discussion and adoption in principle of informal documents GRSP-77-09, GRSP-77-10, GRSP-77-11 and GRSP-77-12 under agenda item 24 (b) (see paragraph 48), GRSP adopted informal document GRSP-77-12 together with ECE/TRANS/WP.29/GRSP/2025/4 (as reproduced in annex V to the session report) and requested the secretariat to submit them as a proposal for supplement 3 to the 04 series of amendments to UN Regulation No. 129 to the November 2025 sessions of WP.29 and AC.1.

48. The International Whole Vehicle Type Approval (IWVTA) Chair informed GRSP that following the adoption by AC.1 of an amendment to Schedule 5 of the 1958 Agreement during its March 2025 session, IWG IWVTA had prepared amendments to delete the Unique Identifier (UI) descriptions from UN Regulations Nos. 16 (informal documents GRSP-77-03, GRSP-77-04 and GRSP-77-05), 22 (informal documents GRSP-77-06 and GRSP-77-07), 44 (informal document GRSP-77-08) and 129 (informal documents GRSP-77-09, GRSP-77-10, GRSP-77-11 and GRSP-77-12). He suggested that it would be desirable to implement these amendments in conjunction with other revisions at an appropriate time. The expert from the Kingdom of the Netherlands supported the amendments and reiterated the suggestion to wait until other amendments were needed for each of the affected regulations in order to group them with these amendments and avoid a proliferation of supplements. GRSP adopted all ten informal documents in principle and agreed to wait to convert them into working documents until other amendments to the concerned UN Regulations were needed.

28. The expert from the Kingdom of the Netherlands presented informal document GRSP-77-34 dealing with removal of inserts and informal document GRSP-77-35 dealing with shoulder height requirements and announced his intention to come back to the next session with working documents.

31. The expert from the Kingdom of the Netherlands presented ECE/TRANS/WP.29/GRSP/2025/31 to clarify that the removal of an insert may also trigger additional tests with alternative dummy statures and to delete the Unique Identifier (UI) descriptions (see ECE/TRANS/WP.29/GRSP/77, paragraph 48). GRSP adopted ECE/TRANS/WP.29/GRSP/2025/31 and requested the secretariat to submit it as a proposal for supplement 4 to the 04 series of amendments to UN Regulation No. 129 to the June 2026 sessions of WP.29 and AC.1.