The session agenda includes discussion of the current draft UN Regulation for buses and coaches including homework feedback, feedback on the proposal in GRE from the South Korea delegate, preparation for the 1–5 June 2026 GRSP meeting, and any other business.

From 1 July 2013 all new School Buses in Australia must be fitted with a Child Safety Alarm system hardwired from the vehicle ignition circuit and powered from the vehicle battery. The system must activate after no more than five minutes of operation or immediately once the passenger door has been opened or closed, cannot be overridden by the operator, and can only be deactivated after the disabling switch is actioned. The disabling switch must be located inside the vehicle behind the rearmost passenger seats requiring the driver to walk to the rear to deactivate it. An audible alarm must sound when the engine ignition switch is turned off and the disabling switch has not been actioned, and must be audible from up to 10 metres distance.

KATRI reported on the 131st GRSG session. OICA raised concern that the scope of the draft regulation is not clear, noting that vehicles of categories M₂ or M₃ class B and III designed or equipped primarily for the carriage of children equals all of M₂ or M₃ vehicles since there is always a possibility of carrying children, and stated it is now checking TF STBC documents. CIVD stated that vehicles used for camping need to be exempted from scope, noting this is reasonable but questioning how. Denso asked whether warning method of visual and audible is different between buses and light vehicles, noting this is done, and stated it seems possible to add new regulation number in UN R48.

The CLIV informal group held its 15th session in Seoul from 24–27 March 2026, focusing on drafting performance requirements for buses and coaches. Japan proposed a five-minute inspection duration for drivers to confirm all children have disembarked; however, OICA suggested linking inspection time to passenger capacity. On Day 3, Japan presented a revised position: buses with 25 or more passenger seats require five minutes before a CLIV warning event occurs, while buses with fewer than 25 passenger seats require three minutes. All delegates supported this approach. The IWG agreed to draft papers for submission to affected GRs concerning external audible and visual warning signal proposals and intends to submit the draft UN Regulation to GRSP for informal consideration at the June 2026 GRSP session.

The group will receive comments on the draft UN Regulation for buses and coaches, covering definition order, operation isolation of the physical inspection system, vehicle master control switch definition, transitional provisions, type approval tests, and paragraph 5.4.4.6.2. The agenda includes feedback on a proposal made to GRSG and discussion of the September meeting location.

Proposal to establish uniform provisions for approval of vehicles of categories M₂ or M₃ designed or equipped primarily for carriage of children, requiring physical inspection systems to prevent child occupants being left inside buses and coaches after journey completion. Physical inspection systems shall be engaged when vehicle master control switch is turned off and disarmed via inspection confirmation device located behind rearmost seat. Systems must generate external visual and audible warnings within specified timeframes if not disarmed, with warnings cycling for at least 10 minutes at greater than 60 dB(A) unless system is disarmed or vehicle master control switch is turned on.

Draft text after Day 4 of the informal group session.

Draft text pursuant to the third day of the CLIV informal group 15th session.

Outcomes pursuant to Day 2 of the CLIV IWG session.

Outcomes pursuant to Day 1 of the CLIV IWG session.