Notes from the 3rd meeting of the IWG on Advanced Emergency Braking System, held online 24–25 September 2026. The group reviewed accidentology data showing that 60–70% of pedestrian accidents occur at night, discussed existing regulations including China’s GB 39901-2025 mandatory standard for M₁ and N₁ vehicles entering into force in 2028, and compared Euro NCAP and JNCAP night-time testing protocols. The group agreed to use a homework list as discussion baseline at the next meeting in Tokyo before amending UN R152 text to include requirements for pedestrian collision scenarios at night with artificial lighting.

This regulation establishes uniform approval provisions for Advanced Emergency Braking Systems (AEBS) fitted to motor vehicles of categories M₁ and N₁. The AEBS shall automatically detect imminent forward collisions with vehicles, pedestrians, or bicycles, provide driver warning, and activate vehicle braking to avoid or mitigate collision severity. The system must meet specified performance requirements under defined test conditions for car-to-car, car-to-pedestrian, and car-to-bicycle scenarios. Requirements include collision warning provision, emergency braking of at least 5.0 m/s², active speed ranges, driver interruption capability, deactivation controls, and warning indications. Testing procedures, vehicle conditions, target specifications, and virtual testing provisions are specified.

Document confirms homework points for consideration of night-time requirements for car-to-pedestrian scenarios in UN R152. Topics include vehicle categories M₁ and N₁, crossing and longitudinal collision types, farside/nearside pedestrian direction, pedestrian walking speed of 5 km/h, lighting conditions, collision points at 25%, 50%, and 75%, dummy types, vehicle activation speeds of 30–60 km/h without obstruction and 40–50 km/h with obstruction, and speed reduction. Daytime requirements discussion covers car-to-car speed reduction at 80 km/h, collision point revision, and car-to-pedestrian speed reduction review based on current technology.

The document describes a project to identify Advanced Emergency Braking Systems (AEBS) performance gaps by analysing real-world collision data from UK national research and police databases. The study characterised collision cases against the requirements of UN Regulation No. 152, using STATS19 and RAIDS data sources. Cases were filtered for eligibility, then scored against current test scenarios using weighted collision characteristics including subject vehicle speed, target vehicle speed, relative speed, ambient light, and overlap. Results indicate the coverage provided by relevant test scenarios and identify which characteristics may address gaps in AEBS operational performance.

Japan presents the current status of Advanced Emergency Braking System (AEBS) testing for passenger vehicles in night-time conditions under the Japan New Car Assessment Program (JNCAP). The document describes test procedures for car-to-pedestrian scenarios, including car-to-pedestrian farside (CPF) and car-to-pedestrian farside obstructed (CPFO) scenarios, conducted with and without street lighting. Test speeds range from 30 to 60 km/h. Test conditions specify tolerances for vehicle velocity, pedestrian target velocity, lateral position, collision point, yaw rate, steering angular velocity, and braking temperature.

Presentation of traffic accident data for car-to-pedestrian collisions occurring at night in Japan. Approximately 65 to 70 per cent of traffic accidents for car to pedestrian in Japan occur at night-time. The data cover the 10-year period from 2015 to 2024 and analyse obstruction, pedestrian direction of crossing, collision point, walking speed, and age. Seventy per cent of pedestrians cross from the right at night. Accidents involving children aged 12 and under are extremely rare. Vehicle speeds range from 30 km/h to 60 km/h without obstruction and 40 km/h to 50 km/h with obstruction. The proportion of passenger cars equipped with AEBS night-time is approximately half.

Draft agenda for the Informal working group on Advanced Emergency Braking System meeting 24–25 September 2026. Welcome and Introduction. Approval of the agenda and previous meeting report (AEBS2-02-03). Confirmation of TOR of this informal working group (document GRVA-24-14/Rev.2). Accidentology: share accident data from other CP. Review of existing regulation, technologies and state of the art. Draft state-of-the-art performance requirements for collision scenarios involving pedestrians at night. Other business. List of action items and next meetings. 4th IWG: 2–4 November 2026 in Tokyo.

Analysis of pedestrian accident data from the GIDAS database (accident years 2005 onwards) comparing day and night situations across crossing and along-carriageway scenarios. Night situations show higher fatality rates than day situations. Data presented for crossing scenarios with and without obstruction, at junctions, and along straight roads, with documented cases from pure car-to-pedestrian constellations.

GB 39901:2025 establishes technical requirements and testing methods for advanced emergency braking systems of vehicles of categories M₁ and N₁, based on UN Regulation No. 152, 02 series of amendments and China’s road accident data. Performance requirements cover collision warning and emergency braking for vehicle, child pedestrian, bicyclist, and powered two-wheeler targets, with car-to-car test speeds extended to 80 km/h for M₁ vehicles. The standard includes general requirements, functional safety, electromagnetic compatibility, robustness, false response testing, and optional simulation testing. Night-time scenarios were tested but not adopted as mandatory requirements pending international consensus on test methods.

Summary of “Euro NCAP Technical Bulletin CA 101 – Crash Avoidance” for consideration in the context of UN R152.

GRVA will continue to establish and maintain the United Nations regulatory framework for Automated Driving Systems, including UN R185 and GTR 26. GRVA will continue its work on cyber security, over-the-air software updates, and the Data Storage System for Automated Driving. GRVA will focus on implementation of ADS and development of provisions for the Exchange of Scenario-Relevant Information. GRVA will further elaborate requirements for Advanced Driver Assistance Systems, building on UN R79 and UN R171, and for Automated Emergency Braking Systems, building on UN R131 and UN R152.

Document outlining GRVA’s priority activities for 2027 based on ECE/TRANS/WP.29/2026/1. GRVA will continue establishing and maintaining the United Nations regulatory framework for Automated Driving Systems, including UN R185 and GTR 26, with work on cyber security, over-the-air software updates, and the Data Storage System for Automated Driving. GRVA will focus on ADS implementation, provisions for Exchange of Scenario-Relevant Information, and elaboration of requirements for Advanced Driver Assistance Systems and Automated Emergency Braking Systems building on UN R79, 171, 131, and 152.

The IWG on AEBS held its second meeting virtually on 18 June 2026 and decided to submit ECE/TRANS/WP.29/GRVA/2026/38 for approval, an amendment adding a footnote to clarify that Sufficient nominal Peak Braking Coefficient should be understood as a minimum value. The IWG plans to collect accident data from jurisdictions, existing regulations, technologies, and state-of-the-art performance requirements for collision scenarios involving pedestrians at night. A schedule of future informal meetings is provided through January 2028, with a draft regulation planned for availability by January 2028 and formal submission by September 2028.

Proposal to insert definitions for Software Identification Number, insert requirements for manufacturers to provide necessary information allowing the Technical Service to uniquely identify hardware and software configurations, insert provisions allowing vehicle manufacturers to apply for new approvals to differentiate software versions for registered versus new vehicles, amend production discontinuation provisions to clarify that cessation is not deemed definitive if the manufacturer intends to obtain subsequent extensions for software updates of vehicles already registered in the market, renumber and insert new items in approval communication annexes regarding software identification and software updates including RxSWIN, and insert provisions allowing vehicle manufacturers to obtain new approvals for software version differentiation across multiple UN Regulations (13, 13-H, 79, 89, 130, 131, 139, 140, 152, 155, 156, 157, 171, 175, and 178).

Proposal to amend para. 5.4.2.3. to require that where automatic deactivation of the AEBS function is a consequence of the driver manually switching off the ESC function of the vehicle, this deactivation of the ESC shall require at least two deliberate actions by the driver.

Proposal to amend para. 5.4.2.3. to specify that where automatic deactivation of the AEBS function is a consequence of the driver manually switching off the ESC function of the vehicle, this deactivation of the ESC shall require at least two deliberate actions by the driver, and renumber Footnotes 2 through 8.

Proposal to amend GRVA/2026/27, which proposes amendments to UN R13, UN R13-H, UN R79, UN R89, UN R130, UN R131, UN R139, UN R140, UN R152, UN R156, UN R157, UN R171, UN R175, and UN R178:

• Throughout these regulations, amend references to the Consolidated Resolution on the Construction of Vehicles (R.E.3) as document ECE/TRANS/WP.29/78/Rev.8,
• insert new definitions for Software Identification Numbers referring to R.E.3 Annex 7 para. 2,
• amend requirements for software identification to require manufacturers provide necessary information allowing Technical Services to uniquely identify hardware and software configurations,
• insert new provisions allowing vehicle manufacturers to apply for new approvals differentiating software versions for vehicles already registered in the market from new vehicles,
• amend production discontinuation provisions to clarify production is not considered definitively discontinued if manufacturer intends to obtain subsequent extensions of approval for software updates of registered vehicles,
• insert new items in annexes regarding additional information on software identification and software updates including R_xSWIN identification, whether held on vehicle, how to read if not held on vehicle, and relevant parameters for vehicle identification.

Proposed changes to align RxSWIN provisions with the RxSWIN template adopted through WP.29-197-06, remove the proposed requirement to comply with UN R156/01 or later from R157 and R171, remove amendments to UN R155 as decided by the IWG CS/OTA, apply the RxSWIN amendments also to earlier series of amendments in R13, R13-H, R79, R131, R152, R157, and R171, update references to the latest version of R.E.3, ECE/TRANS/WP.29/78/Rev.8, in earlier series, and correct paragraph references and improve structure in R89, R139, R140, R155, R156, and R171.

The Informal Working Group on Advanced Emergency Braking System held its 2nd meeting on 18 June 2026. Australia had submitted documents GRVA/2026/21 and GRVA-25-36 proposing amendments to UN R152. For para. 2.14, the group agreed to insert a footnote stating “this value is understood to be a minimum value,” with a working document to be prepared for next GRVA. For para. 5.2.1.1, Australia withdrew its proposal to remove the 0.8s TTC warning condition after safety concerns were raised. CLEPA-OICA, UK and Australia will prepare a clarification proposal for next GRVA.