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.

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.