Regarding buses and coaches scope, delegates supported defining school buses as Special Purpose Vehicles, enabling inclusion without creating a harmonized international category. Comments are due by 14 August. The draft light vehicle UN Regulation was uploaded for review with comments due before or during the September in-person meeting in France. An in-person meeting is scheduled for September 2026.

The Children Left in Vehicles Informal Working Group holds its 19th session on 23 July 2026 from 17:00 to 19:00 Australian Eastern Standard Time online. The agenda includes feedback on drafting a UNR for light vehicles and consideration of a September face-to-face meeting in Paris.

The UN IWG for Children Left in Vehicles is in Phase 2 developing a new UN Regulation for vehicle categories M₂ and M₃. The draft UN Regulation includes requirements for visual and audible external warnings in buses and coaches to prevent children being left inside. The external warning shall be visual and audible, with the visual warning remaining on for at least 15 seconds then off for no greater than 30 seconds, repeating in cycles lasting no less than 10 minutes, using type approved direction indicator lamps all flashing with the same frequency. The audible warning shall remain on for at least 15 seconds then off for no greater than 30 seconds, repeating in cycles lasting no less than 10 minutes, and shall be greater than 60dB(A). Both warnings shall stop immediately after the physical inspection system is disarmed or the vehicle master control switch is turned on. The IWG intends to permit audible devices approved to UN Regulation No. 28 or UN Regulation No. 165 to generate the external audible warning.

Proposal to establish uniform provisions concerning the approval of M₂ and M₃ vehicles to assist in the prevention of children being left inside.

This regulation applies to Special Purpose Vehicles of Categories M₂ and M₃, class B and III designed specifically for the carriage of children. Vehicles shall be equipped with a physical inspection system engaged when the vehicle master control switch is turned off and disarmed via an inspection confirmation device located behind the rearmost passenger seat. An external visual and audible warning must be generated within 3 minutes for buses not exceeding 22 passenger seats, or within 5 minutes for buses exceeding 22 passenger seats, if the system is not disarmed. The visual warning shall remain on for at least 15 seconds, then remain off for no greater than 30 seconds, repeating in cycles lasting no less than 10 minutes. The audible warning shall be greater than 60 dB(A) with the same cycle requirements. Conformity of production procedures shall comply with Schedule 1 E/ECE/TRANS/505/Rev.3, with suitable controls checking dimensions and quality procedures.

UTAC is an automotive test and development center located in Linas-Montlhry, approximately 30 minutes from Paris Orly Airport. The organization operates multiple proving grounds globally, including facilities in Mortefontaine, Millbrook, Finland, and Oued Zem, with over 70 kilometers of test tracks across locations. UTAC provides event and training spaces, including a main modular venue called Le 1924 and a VIP Motul meeting room, alongside specialized testing capabilities for autonomous vehicles, connected vehicles, and electric vehicle development.

UTAC, Linas-Montlhry will host the CLIV IWG meeting 8–11 September 2026. The meeting room, Hellé Nice, is 4080 m², renovated in 2021, accessible without elevator, multimedia equipped, and near the main entrance. Accommodation options include Ibis Montlhry Paris Sud, B&B Hotel Brétigny-sur-Orge, and Comfort Hôtel Linas Montlhry; UTAC can arrange morning and afternoon transport. On-site catering includes water, coffee, tea, and paid lunch through the cafeteria at 15–20 per person. Wi-Fi and French Type E electrical outlets will be available. Delegates should confirm participant numbers by the first week of September using the attendance details form.

Proposal to establish uniform provisions concerning approval of M₁ and N₁ vehicles to assist in prevention of child occupants left inside, specify that vehicles of category M₁ with rear row designated seating positions that can accommodate a Child Restraint System and vehicles of category N₁ with more than one seating row, a Gross Vehicle Mass not exceeding 3,500 kg, and a rear row designated seating position that can accommodate a Child Restraint System shall be equipped with an in-direct plus or direct sensing system, require the system to detect Children Left in Vehicle events for all rear designated seating positions that can accommodate a Child Restraint System with default setting on, allow temporary or long-term deactivation under specified conditions with automatic reinstatement, require warnings to be given immediately after all doors are closed and locked with no more than fifteen to thirty seconds permissible delay and lasting at least ten seconds repeating every ninety seconds for total duration of no less than twenty minutes unless cancelled, establish test procedures including CLIV surrogates aged zero, three, and six years respectively, and specify conformity of production and modification procedures.

The 18th session of the Children Left in Vehicles Informal Working Group convened online on 25 June 2026. Feedback from GRSP on the draft UN Regulation for buses and coaches was positive, with a 10 July submission deadline for further comments. Australia will circulate a preliminary draft UN Regulation for light vehicles to Vice-Chairs before the September face-to-face meeting in Paris. The bus UN Regulation will initially include only Physical Inspection Systems, while light vehicle discussions will address indirect, indirect-plus, or direct sensing systems. A trilateral meeting between Australia, the United States, and Canada made constructive progress on Global Technical Regulation development, with potential for a November WP.29 vote.

UN IWG CLIV presented a draft UN R regulation proposal for buses at May UN GRSP session covering physical inspection system with no sensing required. Discussions on light vehicle regulation, paused since early 2026, can now resume. Light vehicles will have sensing related performance requirements. ISO CPD surrogates availability will be crucial to implement the regulation. UN IWG CLIV will hold a 4-day workshop from 08–11 September, likely at UTAC/France, focusing on light vehicles, welcoming ISO CPD expert participation and presentations on ISO CPD status and test tools.

The agenda includes feedback from the June GRSP session on the submitted draft UN Regulation, next progression of work for light vehicle drafting and consideration of a September face-to-face meeting.

The 17th session of the Children Left in Vehicles informal working group met online on 28 May 2026 to finalise the draft UN Regulation for buses and coaches for presentation at the 79th GRSP session in June. The group agreed to retain the title and scope structure, remove Automated Driving System from definitions, retain Vehicle Master Control Switch wording, include Special Purpose Vehicles, remove the first sentence of paragraph 5.1, replace SOS Morse code signalling requirements with existing hazard warning lights combined with the horn, remove optional requirements from paragraph 5.4.4.6, remove Figure 2 and paragraphs 6.3.7 to 6.4.2, remove Section 11 Transitional Provisions, and remove Annex 2.

IWG CLIV Phase 2 addresses development of a UN Regulation for buses and coaches. The 13th through 17th sessions, held between virtual and in-person meetings from March to May 2026, focused on drafting the bus UN Regulation, refining text on scope, definitions, visual signals, and transitional provisions. Feedback from GRE and GRSG identified scope clarity issues and potential amendments to UN R48. Formal submission of a UN Regulation for buses is anticipated at the 80th GRSP session, with feedback requested before 10 June 2026, and subsequent drafting of a UN Regulation for light vehicles is planned to commence in the second half of 2026.

Proposal to establish uniform provisions concerning the approval of M₂ and M₃ vehicles to assist in the prevention of children being left inside. This regulation applies to vehicles of categories M₂ and M₃ class B and III designed or equipped primarily for the carriage of children, or special purpose vehicles of categories M₂ and M₃ class B and III designed specifically for the carriage of children. Vehicles shall be equipped with a physical inspection system which satisfies the requirements, including that the system shall be engaged when the vehicle master control switch is turned off and shall generate an external visual and audible warning if not disarmed within three minutes for buses not exceeding 22 passenger seats, or within five minutes for buses exceeding 22 passenger seats. The audible warning shall be greater than 60 dB(A).

The CLIV IWG held its 16th online session on 23 April 2026. The group discussed amending the SOS Morse code definition to clarify it as a continuous sequence of three dots, three dashes, and three dots. Delegates agreed the scope for M₂ and M₃ category vehicles requires clearer definition to exclude camper vans and caravans and limit application to vehicles designed or equipped primarily for child carriage. Homework tasks include reviewing UN Regulation definitions for vehicle master control switches, proposing wording for operational isolation of physical inspection systems, and researching paragraph 5.4.4.6.2. The September in-person meeting location remains under consideration, with Paris confirmed as a possible option pending final decision by end of July.

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.

This paper is to inform relevant GRs of the ongoing activities within the CLIV informal group and the potential influence on the work under the responsibilities of the GRs. CLIV is in Phase 2 developing a new UN Regulation on Children Left in Vehicles for vehicle categories M₁, M₂, M₃ and N₁. The draft regulation includes requirements for visual and audible external warnings upon detecting a CLIV event. The IWG prioritises development for buses first, then light vehicles. The draft regulation aims to mitigate risk of serious or fatal injuries to children left in vehicles. Upon detecting a CLIV event, visual and audible external warnings will be generated using an SOS morse code pattern to distinguish from existing warnings.

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.

CLIV is developing a new UN Regulation for vehicle categories M1, M2, M3, and N1 in Phase 2. The draft regulation requires visual and audible external warnings upon detection of a child left in a vehicle. Visual warnings use direction indicator lamps flashing in SOS morse code pattern for at least 15 seconds, then off for no more than 30 seconds, repeating for at least 10 minutes. Audible warnings must exceed 60dB(A) following the same timing pattern. The IWG requests guidance on potential amendments to UN R48, UN R28, and UN R165.

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.