Proposal to correct inconsistencies in isolation resistance monitoring system requirements for vehicles of category O₃ and O₄ trailers to provide optical and/or audible warnings via CAN-Bus signal transmission. High voltage REESS isolation resistance requirement set at minimum 100 Ω/Volt or protection degree IPXXB fulfillment. Requirements do not apply to REESS solely installed on vehicles of category O or batteries used for recuperation.

Proposal to account for vehicles of categories X and Y, extend application to vehicles without driver and without manual driving controls, and address inconsistencies related to REESS provisions. The amendment introduces ADS feature types 1 and 2, modifies warning transmission requirements for ADSF-2, adjusts isolation resistance specifications, and exempts certain REESS requirements for category O and Y vehicles. Changes include updates to Annex 8 stopping conditions and Annex 9E terminology.

Proposal to replace “675 Nm ± 25 Nm” with “a minimum of 650 Nm but no more than 850 Nm” in Annex 4, paragraph 3.5., and in Annex 6, paragraph 2.4.1.

Proposal to modify requirements for headform acceleration derivation, windscreen testing, and approval marks. The document proposes notification procedures for Contracting Parties to share test results via the DETA database, deletes paragraphs 11.1 to 11.4, extends transition periods for atypical windscreen fracture behaviour testing until 1 September 2033 and WAD 2,100 boundary provisions until 1 September 2028, and adjusts bonnet top impact torque specifications from 675 Nm ±25 Nm to between 650 Nm and 850 Nm.

The IWG on SCUNV reports on activities from November 2025 to March 2026. The group held one meeting on 5 March 2026 and four Leadership Team meetings. Chapter 9 challenges regarding emissions methods were addressed by proposing acceptance of OBD results as an alternative and removing EURO wording references to ensure a harmonized global approach. The IWG intends to submit the Draft Resolution to WP.29 for approval as a Formal Document at the June 2026 Session, with formal adoption targeted for November 2026.

Proposal to amend UN R17 Supplement 1 to the 12 series of amendments. The Regulation is amended to account for vehicles of category X. Vehicles of category Y are not in the scope of this Regulation. The Regulation is extended to vehicles without driver and manual driving controls. Multiple amendments are made to definitions, test procedures, and technical requirements for seats, anchorages, and head restraints, including changes to measurement planes, test parameters, and displacement specifications across various annexes and paragraphs.

Proposal to insert a new chapter P and paragraphs 247 and 248 establishing that supply lines for additional TPRDs are constructed from metallic materials with further investigation required for other materials in the next phase, and requiring manufacturers to provide handling procedures to ensure supply lines will not suffer damage or contamination during handling with removal from service of lines with unacceptable damage, exclude the drop test from the requirements at para. 51., and amend para. 81. (c) (i) to clarify that drop impact testing applies to containers without supply lines and valves with damage to supply lines or valves requiring replacement.

Proposal to establish a new UN Regulation on liquefied hydrogen storage systems (LHSS) for hydrogen-fuelled vehicles of categories M₂, M₃, N₂ and N₃, incorporating specifications for the LHSS, specific components including pressure relief devices and shut-off devices, and vehicle fuel system requirements with testing and approval procedures, based on GRSP/2025/41 and GRSP-78-15-Rev.1.

Proposal to amend UN R28 to add definitions for “Front plane,” “Automated Driving System (ADS),” “Dynamic Driving Task (DDT),” “Bi-directional vehicle,” and “Forward direction” in new paragraphs 11.3–11.7; add new paragraph 14.1.3 requiring separate sound pressure measurement for each front plane of bi-directional vehicles; amend paragraph 14.3.3 to specify measurement at 7.00±0.10 m from the front plane; and amend footnote 1 to paragraph 1 to reference ECE/TRANS/WP.29/78/Rev.8.

Proposal to amend Paragraph 1.4., Footnote 1 to update the reference to the Consolidated Resolution on the Construction of Vehicles; insert new paragraphs 2.10. and 2.11. defining “ADS user” and “Vehicle user”; amend Paragraph 5.5.2., Footnote 4 to update the reference to Annex 3 of the Consolidated Resolution; and amend paragraphs 6.1.2.4.1.6.1. and 6.2.2.4.1.6.1. to specify that engine starting-up on petrol and switching to LPG or CNG after a predetermined period cannot be changed by the vehicle user.

Proposal to delete Table of contents, Annex 10 and all its appendices, amend para. 1.1. to clarify application to new pneumatic tyres of classes C1, C2 and C3 in new state regarding sound emissions and rolling resistance and in new and worn state regarding wet adhesion, delete para. 1.3., amend para. 2.18. to specify reference tyres F2872-25, F2871-25, F3678-25 and F3677-23, delete para. 2.21., delete para. 3.1.1.1., amend para. 3.2.1. to describe major features and their effects on tyre performance, delete paras. 5.7. to 5.10., delete Annex 1 items 8.6. and 8.6.1., amend Annex 5 part (b) para. 1.1.1. to establish surface friction values by trailer or vehicle method according to tyre class and SRTT, amend Annex 5 part (b) para. 1.1.1.1. regarding coefficient of variation and peak braking force coefficient, and delete Annex 10. Document based on GRBP/2025/28, GRBP-82-27, GRBP/2026/6, GRBP-83-20/Rev.2 and GRBP-83-48/Rev.1.

Proposal to adapt the UN R133 to include ADS vehicles via updating footnotes that reference the Consolidated Resolution on the Construction of Vehicles (R.E.3.) to Revision 8 which includes ADS vehicle categories X and Y.

Proposal to amend Footnote 1 to reference Consolidated Resolution on the Construction of Vehicles, amend Annex 1 para. 2.6. to modify mass definition and add closure bracket, delete Annex 1 para. 3.4.3., renumber Annex 1 paras. 3.4.3.1., 3.4.3.1.1., 3.4.3.1.2. and 3.4.3.1.3. as 3.4.3., 3.4.3.1., 3.4.3.2. and 3.4.3.3., amend Annex 2 para. 1.9.2., amend Annex 3 Table A3/1 to modify emission standard reference letters, amend Annex 4 para. 5.7.2. to specify vehicle examination and maintenance procedures, amend Annex 4 Appendix 1 paras. 1., 2. and 3. to clarify fuel tank level, warning indicators, and reagent level checks, amend Annex 4 Appendix 5 paras. 18. and 19. to specify user-selectable modes for testing, and amend Annex 5 paras. 2.3. and 2.4. to clarify gearbox test procedures.

Proposal to amend the title of Annex 5 to read “Vehicle user warnings and inducement methods of the Excess Exhaust Emissions Driver Warning System”, amend para. 1 to expand scope to include vehicle user warning systems, amend para. 2 to add abbreviations for Automated Driving System, Hybrid-Electric Vehicle, and Internal Combustion Engine, add new paras. 3.22 to 3.28 defining ADS user, vehicle user, Excess Exhaust Emissions Driver Warning System, SCR warning, SCR inducement, OBM warning, and OBM inducement, amend para. 7.2.1 to specify EEEDWS functions including assigning OBM monitoring status, providing vehicle user warnings, and limiting vehicle use through inducement methods, delete para. 7.9.5, amend Annex 4 paras. 1.9.1, 2.5, 2.6.2, and 2.8.2(b) to clarify OBM system parameters, amend Table 10.1 to retitle as “Vehicle information”, amend Appendix 1 table lines 1.2, 1.43, 1.52, and 3.8 to clarify OBM parameters and add inducement distance parameters, amend Appendix 5 notes and references regarding virtual distance calculations, amend Annex 5 title and paras. 1, 2.2.6.1, 2.2.7.1–2.2.7.4.1, 2.2.8.1, 2.2.8.3, 2.3.1, 2.3.1.3, 2.3.1.5.2, 2.3.5.1–2.3.5.2, 2.4.1.2, 2.4.2.1, 2.4.3.1–2.4.3.2, and 2.4.4.3.1 to establish vehicle user warning and inducement requirements including distance counters, warning display conditions, and inducement activation thresholds, amend Annex 6 para. 2.4 and Appendix 1 regarding small-volume manufacturers, amend Annex 8 paras. 2.10.1 and Appendix 1 to clarify electrical energy consumption calculations, and amend Annex 9 para. 3 to expand technical documentation requirements regarding data integrity.

Proposal to amend UN R83 specifications for emission testing:

• Amend para. 1.1.1., Footnote 1, to update the reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3.) document ECE/TRANS/WP.29/78/Rev.8
• Amend para. 24.3.1. to specify that emission of visible pollutants shall be measured by two methods in Annexes 4 and 5, with special procedures for hybrid electric vehicles or vehicles equipped with an ADS detailed in the service manual
• Amend Annex 5, para. 2.4. to require the gear be in neutral and the drive between engine and gear-box engaged when the test is carried out on a vehicle
• Amend Annex 5, para. 2.5. to detail engine speed demand procedures during testing

Proposal to amend UN R86 testing requirements:

• Amend para. 1, Footnote 1 to update the reference to document ECE/TRANS/WP.29/78/Rev.8
• Amend para. 5.3.2.3. to specify minimum radius of bends and transverse profile requirements for loop track curves
• Amend para. 5.5.1.1.2. to clarify gear ratio selection and acceleration demand during measurement
• Amend para. 5.5.5. to require recording of circuit time Ti, not less than three measurements with specified vehicle path tolerances, and a difference between extreme values not exceeding 3 per cent