Proposal to amend para. 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, para. 2, and amend para. 4.5.1., Footnote 2 to update the reference to Annex 3 of the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev.8.

Proposal to amend UN R86 on various provisions related to vehicle scope, mass definitions, approval references, and test requirements:

• Amend paras. 1.1. and 1.2. to modify the scope for Level 1A and Level 1B
• Insert Footnote 1 to para. 1.
• Amend para. 3.3. to revise the heading
• Amend para. 3.3.3. to redefine “Mass in running order” and clarify driver mass inclusion for vehicles of categories X and Y
• Amend Note a of Figure 3 to align the definition of mass and driver mass treatment
• Renumber Footnote 1 to Footnote 2 in para. 5.4.1. and amend its content to reference the 1958 Agreement distinguishing numbers
• Amend para. 8.3.1. to expand vehicle condition requirements including selectable modes, battery charge mode, ADS features, aerodynamics modifications, test mass composition, driving behaviour verification, and emissions monitoring parameters
• Insert new para. 9.3.5. and new para. 9.3.5.1. to establish special provisions for vehicles equipped with an ADS
• Amend Annex 1 Part 1 to add approval number references to UN Regulation No. 154 and level of approval designation
• Amend Annex 1 Part 2 to add level of approval designation
• Amend para. 12.10. of Annex 1 Part 2 to expand the scope of devices or systems with user-selectable modes to include electric energy consumption
• Amend the explanatory note (h) of Annex 1
• Amend row 21 of Table A4/1 in Annex 4 to modify acceleration demand parameters.

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

The 37th session reviewed a consolidated working document on automotive life cycle assessment integrating comments from Contracting Parties, stakeholders, and the European Commission. Key unresolved issues include electricity modelling, chain of custody, primary data share, logistics, battery replacement, and vehicle lifetime assumptions. The leading team will update the overview table and identify priority issues for discussion. The next session is scheduled for 9 April 2026, with an internal milestone of 19 June 2026 to resolve outstanding issues.

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 R179 Supplement 1:

• Modify the scope to include vehicles of category N₂ between 3.5 and 5 tonnes maximum mass at manufacturer request
• Add abbreviations and definitions including “Category M₁ vehicle”, “Mass in running order”, “Service brake”, “Brake calliper”, “User-selectable mode”, “ADS user”, and “Vehicle user”
• Amend the reference method to require testing on WLTP-Brake cycle using UN R154 compliant chassis dynamometer with external sensors for brake torque
• Specify vehicle selection procedures for testing user-selectable modes resulting in lowest recuperation with possible exemptions for very special limited purposes modes

The document outlines work priorities for UN GTR 21, 22, and 25 amendments. UN R21 Phase 4 will address fuel-cell electric vehicles, measurement alternatives for integrated systems, test method efficiency, and alignment with UN R177. UN R22 Phase 4 will explore conditioning cycles, readiness monitors, certified range performance requirements, and alignment with UN R154-04 and UN R83-09. UN R25 Phase 3 will consider Annex 2 amendments, virtual distance verification, minimum performance requirement thresholds by vehicle category, and alternative test methods.

Proposal to amend UN GTR No. 21 on determination of system power of hybrid electric vehicles and pure electric vehicles having more than one electric machine for propulsion. The amendment introduces a consolidated reference point concept for identifying where mechanical power is first produced from stored energy in electrified powertrains. Two test procedures (TP1 measuring electrical power and engine parameters; TP2 measuring torque and speed at axles) are defined to determine comparable vehicle system power ratings. Key modifications include requirements for manufacturers to provide verifiable energy conversion factors (K factors), hybrid power flow descriptions, and identification of applicable reference points. Testing involves repeated maximum power measurements on dynamometers at fixed speeds with specified accuracy requirements for instrumentation.

Proposal to amend UN R101:

• Enable approval of vehicles equipped with Automated Driving Systems
• Introduce provisions relating to Manipulation Devices and Strategies previously in UN R83 09 series
• Clarify laboratory test requirements for pure electric range ratio at low temperature for Pure Electric Vehicles
• Allow use of actual tyre rolling resistance values in Levels 1A and 2
• Align the Regulation with current regional status and state-of-the-art

Proposal to amend Footnote 1 to reference ECE/TRANS/WP.29/78/Rev.8, amend para. 2.6. of Annex 1 to exclude driver mass for vehicles of categories X and Y, amend para. 3.4.3. of Annex 1 and para. 1.9.2. of Annex 2 to refer to user-selectable operating mode switch, amend para. 5.7.2. of Annex 4 to modify vehicle examination and maintenance checks, amend Table A4/2 of Annex 4 to add procedure to engage ADS testing mode, amend Appendix 1 to Annex 4 to modify examination lines, amend Appendix 5 to Annex 4 to replace driver with user-selectable mode references, insert new para. 3.4. and sub-paragraphs to Annex 6 for additional requirements for vehicles equipped with an ADS, and insert new para. 3.6. and sub-paragraphs to Annex 8 for additional requirements for vehicles equipped with an ADS, remove the provisions relating to manipulation devices and manipulation strategies that are being moved to UN R154 and clarify that in-service conformity checks for electric range of pure electric vehicles at low temperatures are optional, introduce in-service conformity requirements for system power, delete two paragraphs relating to “Operating Mode Switch” that were overlooked when that concept was removed from R83, from both the manufacturer’s information document (Annex 1) and the approval certificate addendum (Annex 2), correct several outdated references following structural changes to UN R154 (04 series of amendments), including updated appendix numbering in paragraphs 2.47, 2.48, and Annex 5, removal of “worst case certified energy consumption Part B family” from Table 4 reporting requirements, and correction of the vehicle survey reference to reflect its relocation to the 9 Series of amendments to UN R83.

Proposal to revise definitions for malfunction indication, reference mass, unladen mass, and vehicle user; add provisions for vehicles equipped with an Automated Driving System; establish documentation requirements for vehicle user warning and inducement systems; update testing procedures for in-service conformity and OBD connector location; and specify activation and deactivation mechanisms for vehicle user warning and inducement systems across multiple annexes, with references to WP.29/1045.

Proposal for a new UN Regulation on the approval of new pneumatic tyres of class C₁ conforming to UN R117 with regard to their tyre abrasion performance, excluding temporary-use spare tyres, tyres with rim diameter ≤13 or ≥25, competition tyres, tyres for vehicles of categories other than M₁–M₃, N₁–N₃, O₁–O₄, ice grip tyres, studded tyres, speed category less than 120 km/h, special use tyres, and road legal race tyres. Abrasion index limits are 1.00 for normal and snow tyres, with adjustments for specific groups. Approval requires marking with approval reference number and suffix (A1 or A2). Testing uses either vehicle test method on public open roads (~8000 km) or indoor drum test method (5044 km), with test facilities demonstrating equivalence per Annex 4. From 1 July 2028, stage 1 approvals required for new types; from 30 June 2030, all types. From 1 July 2033, stage 2 approvals required for new types; from 30 June 2035, all types. Until 1 July 2028, test results from tests performed

RME views: Vehicles were on the road before UN R155 came into force. Retrofitting extends vehicle life in line with climate action and circular economy objectives. Retrofitters must be responsible only for components involved in the transformation and any parts they add or modify, not for original vehicle components. A risk management demonstration dossier limited to the transformed system must be included in transformation approval applications. If the origin vehicle is not R155-approved, retrofitters may provide the dossier without laboratory tests. If R155-approved, authorities decide on compliance, requiring laboratory tests if needed. Manufacturers’ data are not accessible to retrofitters. The application of cyber security provisions (i.e., UN R155 compliance) should be delayed by two years from the entry-into-force of the new regulation for the approval of EC/HFCV retrofit systems and revisions to UN R155 should also provide two-year transitional provisions before the application to the retrofit regulation.

This commented working draft establishes uniform provisions for approving vehicles of categories M and N intended to be converted into pure electric vehicles (EV) or Hydrogen Fuel Cell Vehicles (HFCV) with electric powertrain retrofit systems. The regulation covers retrofit system approval, vehicle approval, application range, installer authorization, and conformity of production. Requirements address electromagnetic compatibility, braking, power measurement, rechargeable energy storage systems, mass and dimensions, and compliance with relevant UN Regulations including UN R10, UN R13, UN R85, and UN R100. The documents includes comments from France and RME.

This Regulation provides uniform provisions for approval of vehicles of categories M₁–M₃ and N₁–N₃ equipped with electric traction chain powertrain retrofit systems to be converted into pure electric vehicles (EV) or Hydrogen Fuel Cell Vehicles (HFCV). Retrofit system manufacturers must submit applications including descriptions of the retrofit system, original parent vehicle, modifications, compliance verification, application range, installed samples, authorized installers, and conversion plates. Type approval requires meeting general requirements for design, construction, durability, and failure communication, plus specific requirements in Annexes 5A for EVs and 5B for HFCVs. Only authorized installers may perform conversions, and manufacturers must provide installation documents and end-user manuals.

The 72nd EPPR session (March 2026) adopted the revised agenda and previous meeting report without changes. The 02 series of amendments to UN Regulation No. 40, transposing UN-GTR No. 2 to Euro 3 emission level (GRPE/2025/22 as amended by GRPE-93-26), was adopted for submission to WP.29/AC.1 in March 2026 and subsequently adopted by WP.29 at its 198th session. The IWG-EPPR Terms of Reference were extended for two years until 2027. IMMA offered to prepare a draft 03 series of amendments to UN Regulation No. 40 for Euro 4, tentatively expected by early June. The group agreed to reconvene around that time. The group reviewed information exchanges on maximum power determination, battery electric vehicle range determination standardization, and deterioration factors in GTR 23 on durability. Next meetings are scheduled for June, July, and September 2026, with the 76th session in October 2026 coinciding with GRPE.

The agenda includes presentations on UN GTR 21 covering highly integrated systems, FCEVs, and more efficient test methods; UN GTR 22 addressing MPRs, SOCR, readiness monitor and conditioning cycles, and mutual recognition; and UN GTR 25 with OICA comments and updates on MPRs/Energy throughput, Part C virtual distance verification, Annex 2, alternative test methods, normal usage indices, and battery replacement provisions.

The eighth meeting of the Informal Working Group on EV/HFCV Retrofit Systems is scheduled for Tuesday 21st April 2026. The agenda includes coordination and organization of work with reference to GRPE-92-14, EVHFCV-02-02, GRPE-93-22-Rev.1, GRSP-78-17, GRVA-24-07, and GRPE-94-06, electrical safety review, cybersecurity, braking, EMC, and UN draft documentation review. Future meetings are planned for 11th June, 2nd July, and 9th September, with hybrid and online formats.

The Informal Working Group on EV/HFCV Retrofit Systems held its seventh meeting on 5th March 2026. The group adopted the provisional agenda, approved minutes of the previous meeting, and acknowledged ongoing activities under GRPE, GRSP and GRVA. Electrical safety review will continue once clarification regarding UN R100 is available. Cybersecurity discussions covered very old vehicles, older vehicles without cybersecurity provisions, and modern vehicles compliant with UN R155. Braking aspects and the structure of the draft UN Regulation were discussed, including vehicle versus system approval approaches and minimum and maximum vehicle age within the regulation’s scope.