Proposal to amend para. 2.27. to redefine “ISOFIX position” as a position satisfying UN R145 requirements to allow installation of ISOFIX child restraint systems as defined in UN R44 and UN R129, amend para. 2.36. to redefine “i-Size seating position” as a position satisfying UN R145 requirements to allow installation of i-Size child restraint systems as defined in UN R129, insert new para. 2.48. defining “Minimum effective seat belt length” as a portion of seat belt webbing usable to restrain an occupant, insert new para. 5.1.11. specifying minimum effective seat belt lengths of at least 2040 mm for 3-point seat belts and 1200 mm for 2-point seat belts in vehicles of categories M₂ and M₃, amend para. 5.2.1. to establish seating position requirements for various child restraint system types by vehicle category, amend para. 5.2.2. to delete reference to manufacturer recommendations, amend para. 5.3.5. to limit information requirements to category M₁ vehicles, insert new para. 11.3. establishing transitional provisions with entry into force of the 02 series of amendments on the official date and mandatory non-acceptance of earlier series approvals issued after 1 September 2030, delete para. 1.2. of Annex 6 Appendix 2, and insert new Annex 8 specifying measurement procedure for minimum effective seat belt length.

The 25th session of the GRSP Task Force on Automated Vehicles Regulatory Screening (AVRS) was held online on 28 April 2026. The Task Force discussed regulatory frameworks for Y-category vehicles, including mass compatibility and crash test exceptions, and reviewed UN Regulation 127 on pedestrian protection for Y-category vehicles. The Task Force also addressed UN Regulation 12 feedback and identified minor mistakes in three proposals: ECE/TRANS/WP.29/2026/63, ECE/TRANS/WP.29/2026/65, and ECE/TRANS/WP.29/2026/71, which require corrections before submission to WP.29.

The agenda includes installation of belted child restraint systems and seat belt minimum length, amendment to UN R107 per document STCBC-TF173-07-02, amendment to UN R173 per document STCBC-TF173-06-05, and amendment to UN R145 per document STCBC-TF173-07-03.

The agenda includes installation of belted child restraint systems, including seat belt minimum length feedback and definition of minimum effective belt length, installation of ISOFIX child restraint systems, amendments to UN R107, ISO pictogram wording revision and dimensions, clarification of the table for M₁ vehicles, introduction of seat belt length requirements for belted child restraint systems on M₂ and M₃ vehicles, amendments to UN R145, ISOFIX force reduction, and proposals to improve ISOFIX definitions across UN Regulations.

The document addresses how to define and measure effective seat belt webbing length for buses of category M₂/M₃. It proposes defining effective length by pulling the lap belt at the geometrical midpoint under a 60-degree angle to form an equilateral triangle, where the leg on the buckle side defines 50 percent of pursued effective length for 2-point belts and 25 percent for 3-point belts. Additional webbing for attachment, handling, connection to spool, and spool length must be added based on seat design and geometry. The proposal suggests the definition may work using diagonal belt alone in the ghost position and questions where to include it in UN R173.

ISOFIX position means a position satisfying regulation requirements to allow installation of ISOFIX child restraint systems as defined in UN R44 and UN R129. i-Size seating position means a seating position satisfying regulation requirements to allow installation of i-Size child restraint systems as defined in UN R129.

UN R145 and UN R173 establish optional ISOFIX installation for vehicles of category M₂ and M₃. ISOFIX seating positions require compatibility with specific Child Restraint Fixture volumes and lower isofix forward strength of 8kN. I-Size seating positions require minimum 440mm distance between adjacent positions, compatibility with ISO/F2X and ISO/R2, and additional support leg strength testing. The document proposes allowing labels on bus windows and removing marking requirements for M₂ and M₃ from UN R145.

UN R21 requires the owner’s manual to contain clear instructions for power-operated window/roof panel/partition systems, including explanation of possible consequences, use of driver-controlled switches, and WARNING messages indicating dangers to children and requiring special care with remote closing systems. UN R173 references to Annex 9, paragraph 3 are unnecessary as this paragraph no longer exists in R173 but is now in UN R16 S10 Annex. UN R94 Annex 3 requires a line break.

Proposal to enable application to vehicles of category X. For vehicles of category X, the R point of the most forward passenger seat shall be taken instead of the R-point of the driver’s seat. A seating position with steering control placed in front may be designated as suitable for Child Restraint System installation if requirements for a passenger seating position are fulfilled. The Regulation does not apply to vehicles of category Y.