Since the 24th (January 2026) GRVA session, the ADAS task force held an online session on 3 March 2026. A 02 series of amendments to UN R171 (GRVA-24-17/Rev.2) was approved and submitted to WP.29 as WP.29/2026/86. Draft supplements and consolidated and extracted versions for 00 and 01 series were prepared (GRVA-24-18-A, GRVA-24-19-A, GRVA-24-18-B, GRVA-24-19-B). For the 25th GRVA session, editorial modifications and consolidated and extracted versions were submitted (GRVA/2026/14, GRVA/2026/15, GRVA/2026/16, GRVA/2026/17, GRVA/2026/18). The task force seeks guidance on provisions for DCAS use on highway-like roads and feedback on existing provisions following practical implementation of UN R171. The ADAS task force will be maintained with a break in activities pending stakeholder inputs and concrete proposals.

UN R13 and UN R78 establish different brake system requirements for 4-wheel vehicles. R13H requires split service brake systems with front/rear proportioning; R78 permits split service brake systems, combined brake systems, or two separate service brake systems without proportioning requirements. Type-O dry braking tests differ: R13H requires engine disconnected at 100 km/h with stopping distance 0.1v + 0.0060 v² and MFDD 6.43 m/s²; R78 specifies multiple tests at 40, 60, and 100 km/h with varying requirements. Type-I brake fade tests use different snub protocols and performance thresholds. Secondary braking failure criteria differ at specified speeds. R78 requires wet brake testing, a 30 km/h dynamic park brake test with 18% gradient and 5 minutes hold time; R13H specifies static gradient tests. R78 includes detailed ABS, functional safety, and regenerative braking requirements; R13H does not.

No vehicles have received certification under UN R175-00/01. The document lists representative ACPE-equipped vehicle models from various manufacturers and markets, detailing their sensor configurations, target objects, and operation speed ranges. Sensor types include ultrasonic sonar, monocular camera, stereo camera, and milli-wave radar. Target objects are stationary objects and pedestrians. Vehicles exhibit variation in forward and rearward equipment and low-speed braking function inclusion. Performance definitions differ by OEM and are not directly comparable across manufacturers or to UN R175 requirements.

Proposal to insert new sub-paragraph 5.6.1.1.4.1 establishing that requirements of paragraph 5.6.1.1.4 shall not apply to ACSF Category A functions provided they are intended solely to support low-speed vehicle controllability manoeuvres in off-road environments, operate only until 5km/h with 1km/h tolerance, require deliberate driver activation, require driver presence in driver’s seat with fastened safety belt, and allow driver to retain control and override or deactivate the system at any time.

Proposal to amend para. 2.8 of Annex 8 to add subparagraph (c). The amendment addresses trailers utilizing service braking system energy reserves for automatic brake requirements. Current para. 2.8 includes options (a) and (b) requiring spring brake pressure reduction or corresponding pressure reduction in spring compression chamber. New subparagraph (c) permits alternative designs where combined service braking and parking braking system activation holds a laden trailer on 18 percent gradients at any service brake energy reservoir pressure from 850 kPa to 0 kPa, providing greater realization flexibility while maintaining required holding performance.

Proposal to amend para. 2.8 of Annex 8 to UN R13 to require trailers utilizing service braking system energy reserves to fulfil one of three requirements when uncoupled and park brake control released: pressure in spring brake compression chamber shall reduce to 0 kPa when energy reserves reduce to 280 kPa, pressure reduction in service braking system energy reserve results in corresponding reduction in spring compression chamber pressure, or combined service and parking braking forces shall hold laden trailer as required when service brake energy reservoir reduces from 850 kPa to 0 kPa.

Single N₁ and N₂ vehicles with fluted brake drums for parking brakes cannot be inspected on roller and plate test benches or in test drives. Electric parking brake systems cannot be tested on roller and plate test benches or test drives, and wheels cannot be turned on lifts to inspect for damages or bearing wear. Some vehicles have hydraulic braking systems with brake fluid reservoirs not accessible without dismantling or special tools, requiring removal of covers, fasteners, and screws to access brake fluid for inspection. PTI inspection provisions require updating to address these vehicle design variations.

The meeting will address coordination of work, pollution emission control in PTI including PN measurement, NOx measurement, and Euro 7, Advanced Driver Assistance Systems and Automated Driving Systems including PTI using diagnostic devices and inspections of automated vehicles, PTI provisions for brakes, lighting devices coordination and inspection, and 1997 Agreement updates.

Proposal to insert new para. 3.1.1. and 3.1.2. requiring manufacturers to provide information to approval authorities prior to application and upon extension of type approval; insert new para. 3.2.2. requiring manufacturers to provide summaries of safety definitions, driver safety levels, traffic rules assessment, and testing for each territory where ALKS can be active; and insert new paras. 4.6. to 4.6.6. establishing procedures for approvals covering multiple territories, including notification of receiving approval authorities at least 30 days before approval, review periods, and dispute resolution under the 1958 Agreement. OICA and CLEPA do not support mandatory pre-announcement but would support sharing Safe Operation documentation and lists of compliant territories during the approval process.

Proposal to amend para. 5.6.1.2.7. to increase the maximum RCP operating range from 6 m to 15 m. UN R79 currently limits the maximum RCP operating range to 6 m, resulting in effective usable range of 2 or 3 m due to radio wave-based ranging inaccuracy. A 15-meter range would enhance RCP function usefulness and safety, reducing driver movement and blind areas. RCP systems with extended ranges have been used in large markets without identified safety threats. The amendment is proposed as a supplement to the 03 and 04 series of amendments to UN R79.

Proposal to amend Annex 8, para. 3.4.1. to require the vehicle manufacturer to supplement its statement with an explanation of how the chosen strategy ensures system objectives do not prejudice safe operation of systems referred to and a description of the validation plan, and to require the designated technical service to perform an assessment of the manufacturer’s explanation and validation plan suitability and may perform or require tests as specified in para. 4., and amend Annex 8, para. 3.4.4. to require documentation supported by analysis showing system behaviour on fault occurrence including faults with other systems involved in achieving system function, to establish and maintain analytical approaches open for inspection by the designated technical service at type approval, and to require the designated technical service to perform assessment including inspection of safety approach at concept and system levels and validation plans and results.

Proposal to amend GRVA/2026/13 and the 00 and 01 series of amendments of UN Regulation No. 157, modify the Introduction to remove reference to 60 km/h maximum speed and change “override” to “deactivate”, amend para. 5.1.1. to clarify that the activated system shall be free of unreasonable risks for both vehicle occupants and other road users and shall not cause reasonably foreseeable and preventable collisions, amend para. 10.1.1. to remove reference to foot controls, amend Annex 4 para. 3.5.4. to require manufacturers to report critical incidents to the Type Approval Authority, insert new Annex 4 para. 3.5.4.1. requiring the Type Approval Authority to upload information to DETA within 14 days of receipt, and insert new Annex 7 providing guidance for data exchange via DETA in accordance with para. 3.5.4.1. of Annex 4.

Proposal to insert provisions on software identification and software updates into UN R13, UN R13-H, UN R79, UN R89, UN R130, UN R131, UN R152, UN R155, UN R156, UN R157, UN R171, UN R175, and UN R178 by adding definitions referencing Consolidated Resolution R.E.3 Annex 7, requiring manufacturers to provide Technical Services with information on hardware and software influencing performance, permitting vehicle manufacturers to apply for new approvals differentiating software versions for registered versus new vehicles, clarifying that production discontinuation does not apply when manufacturers seek approval extensions for software updates of registered vehicles, and amending communication forms to include software identification numbers and related information.

Presentation on electrically propelled and recuperating trailers. The document outlines communication flows between towing vehicles and e-trailers using ISO 11992-2 over ISO 7638-1, involving parameter groups EBS14 (control), EBS28 (energy/state of charge), and EBS29 (status). Key principles include the towing vehicle setting control modes and requesting torque, with trailers reporting capabilities. The document discusses support for maximum three e-axle equipped trailers due to bandwidth limitations, enabling of e-trailer control via CANopen Service Data Objects, and backward compatibility with ISO 11992-2:2014. Amendments to UN Regulation 13 are planned with target entry into force in May 2028.

Proposal to delete paragraph 1.2.6. excluding e-axle trailers with e-axles providing electric propulsion and/or incorporating an electric regenerative braking system from the scope of UN R13, and add definitions of “e-axle,” “e-axle trailer,” “dynamo function,” and “e-trailer”; add special requirements for power-driven vehicles supporting e-trailer operation, e-axle trailers equipped with dynamo function, and e-trailers of category O; add requirements for electric control lines conforming to ISO 11992-2:²⁰²⁷; specify message support and functional compatibility; and add provisions for electric regenerative braking, dynamo function, and propulsion, including parameters such as retarder torque demand priority, propulsion force limits, overriding mode activation at speeds below 15km/h, and vehicle stability function interaction.

Proposal to remove para. 5.2.1.2. titled “Emergency braking” and delete the corresponding justification text “Update to paragraph 5.2.1.2.” At the January 2026 GRVA, it was agreed not to proceed with an amendment proposed to para. 5.2.1.2. The current proposal GRVA/2026/21 does not reflect the discussions from the previous session of GRVA.

Proposal to amend para. 3.5.1. of Annex 4 to require the manufacturer to demonstrate to the approval authority that effective processes, methodologies and tools are in place, up to date and being followed within the organization to manage the safety and continued compliance throughout the product lifecycle, and to demonstrate to the approval authority at least every three years that the safety management system continues to comply with these requirements.

Supporting presentation on the proposal to insert a new sub-paragraph 5.6.1.1.4.1 to exempt ACSF Category A functions intended solely to support low-speed vehicle controllability manoeuvres in off-road environments from the obstacle detection requirements of paragraph 5.6.1.1.4, provided the function operates only until 5 km/h with 1 km/h tolerance, is activated deliberately by the driver in off-road environments only, requires the driver to be in the driver’s seat with safety belt fastened, and allows the driver to retain control and override or deactivate the system at any time.

Proposal to develop UN GTR for both assisted and automated parking. The document presents parking product classifications in China, including assisted parking (park-in/park-out, cruising capability, remote-control variants) and automated parking systems. Current UN Regulations lack specific technical requirements, test methods, and test scenarios for parking functions. China is developing national standards GB for parking combined driver assistance systems and automated parking systems, with approval expected by end of 2026 and early 2027 respectively. The proposal suggests establishing a Task Force to study applicability of current UN Regulations to parking products, then determining whether to establish an IWG or formulate new regulations.

Proposal to amend para. 5.3.3.2. to correct a referencing error by replacing the reference to para. 5.1.4. with a reference to para. 5.3.1.1., which directly relates to mechanical parts of the steering transmission, thereby removing possible uncertainty or the need to liaise with the designated technical service or approval authority to confirm interpretation of the current text.

The AEBS IWG held its initial meeting virtually on 22 April with about 50 attendees. Co-Chairs are Germany and Japan; Co-Secretaries are CLEPA and SAE. The IWG is requesting minor changes to its Terms of Reference. A schedule of meetings is planned from September 2026 through September 2028, including informal meetings for input from contracting parties and industry, discussion of requirements for speed reduction in nominal conditions, and investigation of false positives, with a draft regulation document planned for January 2028 and formal submission planned for September 2028.

Proposal to revise the terms of reference and rules of procedures for the Informal Working Group on Advanced Emergency Braking Systems. The IWG shall review current regulatory actions and data on Automated Emergency Braking Systems and provide recommendations on future regulatory actions including revisions to UN Regulation No. 152. The IWG shall examine current AEBS regulations worldwide, assess accident situations for passenger vehicles, draft state-of-the-art performance requirements for collision scenarios involving pedestrians at night, investigate regulatory improvements to performance requirements, and investigate feasibility to include updated requirements to avoid false activation of AEBS for light vehicles. The IWG shall deliver complete regulatory text for AEBS for passenger vehicle requirements as revision of UN Regulation No. 152 for the September 2028 session of GRVA at the latest.

Proposal to amend para. 5.3. to require that the effectiveness of ELKS shall not be adversely affected by magnetic or electrical fields, demonstrated by fulfilling the technical requirements and respecting the transitional provisions of the 06 series of amendments to UN Regulation No. 10.

Amends para. 5.3. to insert requirements that ELKS effectiveness shall not be adversely affected by magnetic or electrical fields, demonstrated through UN Regulation No. 10 (06 or later) series; para. 6.2.2.1. to require vehicle operating instructions include situations where ELKS is automatically deactivated; para. 6.5.2., 7.2.1., and 8.2.1. to reference UN Regulation No. 130 in its 01 series of amendments; para. 7.2.2.3. to insert “(the latest occurring warning)”; para. 8.3.3.1. to reference para. 6.6.2.1.; and inserts para. 14. establishing transitional provisions applicable from entry into force until 1 September 2030.

For the purposes of type approval under any UN Regulation requiring the verification of the timing of a system intervention, manufacturers shall provide to the approval authority or its designated technical service information on the method by which the initiation of any system intervention can be objectively identified and retrieved, including specific flags, status bits, event codes on in-vehicle networks, or visual indications on screens; clear instructions and all necessary tools for the Technical Service to extract, access and interpret the signal identifying the initiation; documented procedures including corresponding data sources, resolution, and timing accuracy appended to the type approval test report; and, where a visual indication displayed on a screen is used, documented latency between the earliest internal point at which the system initiates the function and the moment the visual indication becomes visible on the screen, expressed as a fixed value with associated uncertainty, with the documented latency value used to correct the observed timing of the screen indication appended to the type approval test report.