Proposal to amend Annex 2 – Appendix 1 to add para. 1.4.1. specifying user-selectable mode(s) resulting in the lowest recuperation and relevant pre-test procedures for vehicles with a vehicle specific c-factor according to Annex 5, and to delete items not brake emission related including brake circuit configuration, secondary braking system declaration, brake valve specifications, master cylinder type and size, and booster type and size.

Explanatory document on proposed amendments to UN R168 to enable real driving emissions testing of hydrogen internal combustion engine vehicles. The work-based approach replaces the CO-based moving averaging window methodology currently inapplicable to hydrogen-fuelled vehicles. Engine speed and torque data replace carbon monoxide to define window size and calculate the RDE/WLTP work ratio. Testing of a light commercial vehicle demonstrates the methodology’s practical applicability under regular and severe driving conditions, with results processed through independent post-processing tools.

Proposal to replace para. 9.3.2.1., replace paras. 9.3.2.8.1. and 9.3.2.9.1., amend paras. 9.3.9.2.2. and 9.3.9.6., and insert new Appendices 10 and 11. The replacements clarify measurement principles, specify that analyser assessment may be conducted by type-approval authorities, designated technical services, or metrological institutes preferably via witnessed testing at the instrument manufacturer premises, and provide protocols and certificate models for analyser assessment. Amendments to para. 9.3.9.2.2. permit alternative humidification techniques and clarify that test gas shall be humidified to a water concentration approximately equal to the maximum water concentration expected during emission testing for all fuels. Amendment to para. 9.3.9.6. specifies that spectral resolution shall have a nominal value ≤0.5 cm⁻¹ to minimise cross interference.

Proposal to amend Annex 5, para. 5. to define Part C: Verification of reported assessment of virtual distance, amend para. 5.1. to specify the verification procedure including measurement of total discharge energy and approval by the responsible authority, insert new sub-paras. 5.1.1. through 5.1.5. to establish environmental temperature requirements, initial State of Charge setting, discharging test specifications, test termination conditions, and verification test procedures with Table 4 steps, and amend para. 5.2. to establish pass/fail criteria based on comparison of reported delta virtual distance to measured virtual distance with a 5 per cent threshold and statistical decision procedures using Table 5.

Proposal to insert a new definition of hydrogen ICE vehicle, add a note to paragraph 6.1 specifying emissions requirements for 4-phase and 3-phase WLTC analysis, amend paragraphs 8.2, 9.3.1, 9.5, 10.2, 10.6, and 10.7 to clarify trip validity assessment procedures, amend Figure 6 to reflect updated assessment procedures, amend Table A4/1 to add engine fuel flow parameter and clarify mandatory parameters for hydrogen ICE vehicles, insert a new row in Table A5/1 for hydrogen, amend Annex 6 paragraph 3.2.2 to require engine speed and torque recording for hydrogen ICE vehicles, insert hydrogen in Table A7/1, retitle Annex 8, amend Annex 8 paragraph 1 to clarify application of moving averaging window method, and add new Annex 8a establishing an alternative moving averaging window methodology based on engine work for hydrogen ICE vehicles, and amend Annex 11 paragraphs 2, 3.1, and 3.2 and Figure A11/1 to incorporate work ratio calculations for hydrogen fuel tests.

Proposal to amend para. 3.7.1. to define rated engine power by reference to UN R85 or UN R177, modify para. 6.3.2.2. to specify applicability to Level 1A only (original and 02 series) or 4-phase WLTP test only (01 and 03 series), amend para. 6.3.2.3. to apply only to Level 1B (original and 02 series) or 3-phase WLTP test (01 and 03 series), modify Annex B1 para. 2.3.2. to except PEVs from Class 3 classification for Level 1B only (original and 02 series) or 3-phase WLTP test only (01 and 03 series), amend Annex B4 para. 6.2.1. and 6.2.4. regarding facility approval duration and validation, and modify Annex B8 para. 1.4., 3.4.1., and 4.1.2. to specify applicability to Level 1B or 3-phase WLTP test and adjust vehicle classification and testing requirements accordingly.

Proposal to:

• Insert a new para. 4 and 5 to the introduction of the 02 series and para. 5 and 6 to the introduction of the 03 series clarifying that the 03 series includes harmonised procedures and that amendments account for vehicles of categories X and Y equipped with Automated Driving Systems,
• Amend para. 2.1. to add ADS to general abbreviations,
• Amend para. 3.2.5., 3.2.31., 3.2.37., 3.5.8., 3.5.9., and 3.5.12. to include vehicle user terminology,
• Insert new para. 3.5.13. to 3.5.16. defining ADS road load determination mode, ADS testing mode, ADS user, and vehicle user,
• Amend para. 3.10.1., 3.10.4., and 3.10.20. concerning On-Board Diagnostic systems and malfunction indication to reference vehicle users and ADS,
• Insert footnote definitions referencing ECE/TRANS/WP.29/2026/153,
• Amend multiple paragraphs throughout Annexes A1, B4, B6, B8, C3, C4, and C5 to accommodate ADS operation,
• Insert new para. 4.2.1.8.6. to Annex B4 specifying ADS road load determination mode requirements for vehicles of categories X and Y,
• Insert new para. 2.4.2.7. to Annex B6 specifying ADS testing mode functional requirements,
• Amend various provisions concerning driver-selectable modes, reagent warning and inducement systems, and OBD monitoring to apply to vehicles equipped with ADS.

Proposal to establish uniform provisions for approval of non-original replacement and identical brake pads, drum brake linings, brake discs, and brake drums for vehicles of category M₁, N₁, and N₂ between 3.5 and 5 tonnes maximum mass. The regulation applies brake emission testing procedures and particle emission limits by vehicle category and powertrain technology, with PM10 limits ranging from 3 mg/km for PEV vehicles of categories M₁ and N₁ to 11 mg/km for N₁ Class III and N₂ vehicles. Brake parts must be assigned to families based on characteristics including calliper type, axle location, friction material formulation, disc or drum material, brake disc surface form, pad surface area, and drum diameter. Approval requires testing of a family parent brake assembly and includes conformity of production requirements with annual sampling and statistical verification procedures.

Session agenda for the 100th meeting of the Electric Vehicles and the Environment Informal Working Group on 13 October 2026. The agenda covers status reports and presentations on UN GTR 22, UN GTR 21, and UN GTR 25, with discussion of Euro 7 review clause, readiness monitoring, and regulatory topics including MPRs, energy throughput, and Part C virtual distance verification.

Proposal to amend UN Regulation No. 40 concerning the approval of motorcycles and mopeds with positive-ignition engines regarding emission of gaseous pollutants by establishing comprehensive specifications and test procedures. The regulation applies to vehicles of categories L₃, L₄ and L₅, defining test requirements including Type I (exhaust emissions after cold start), Type II (tailpipe emissions at idle and free acceleration), and Type VII (energy efficiency). Vehicle sub-classification by engine capacity and maximum speed determines applicable test cycles from the WMTC procedure. Emission limits are specified for carbon monoxide, hydrocarbons, and nitrogen oxides. Conformity of production procedures are detailed with sampling and statistical analysis methods. Transitional provisions permit approvals under preceding series and from two years after entry into force allow refusal of first registration for vehicles not meeting the 03 series requirements.