Proposal to amend UN R154 road load determination procedures by introducing an optional calculation method for road load coefficients based on component dynamometer measurements from two reference vehicles, establishing boundary conditions permitting up to 300 kg vehicle weight difference and unlimited aerodynamic configuration variation, and allowing optional calculation of the linear coefficient f₁ using the mean value of measurements from both vehicles to reduce measurement uncertainties.

Proposal to amend Annex B4, para. 4.2.1.1.1. to specify vehicle H selection without interpolation based on highest cycle energy demand and wheel selection criteria, amend para. 4.2.1.1.2. to permit optional interpolation method using two test vehicles or one vehicle tested twice with specified configurations, amend para. 4.2.1.5. to specify operation of movable aerodynamic body parts during road load determination, amend para. 4.2.2.1. to establish tyre rolling resistance measurement according to UN R117 02 series amendments and introduce Table A4/2 with rolling resistance classes and coefficients for C1, C2 and C3 tyres, amend para. 4.3.1.4.3. to establish rejection criteria for road load measurements not exceeding one-third of total measurement pairs and data evaluation procedures, amend para. 6. heading to include optional procedures for road load determination and calculation, amend para. 6.8. to permit optional measurement of friction differences on component or suitable dynamometer, add new paras. 6.9. to 6.10.1.1. to establish component dynamometer test procedures and optional calculation method for road load based on base vehicle measurement and technical vehicle parameters, and amend Annex B7 paras. 3.2.3.2.2.2.2. and 3.2.3.2.2.4. to reference Table A4/2 rolling resistance classes and permit optional calculation using actual tyre rolling resistance values.

Proposal to introduce new regional requirements from Contracting Parties, in particular from Euro 7 in the EU, including new particle number (PN10) provisions, a new SHED limit for evaporative emissions, updated On-board Fuel Consumption Monitoring provisions, and new annexes with requirements relating to in-vehicle battery durability and a new test for range of Pure Electric Vehicles at low temperatures for UN R154 (Worldwide harmonized Light vehicles Test Procedures (WLTP)).

Devices for monitoring on-board vehicle consumption of fuel and/or electric energy shall determine and store lifetime values of fuel consumed, distance travelled, and energy parameters specified in Appendix 5. Type-approval requires testing per Table A according to vehicle category and fuel type, including Type 1 emissions tests, evaporative emissions tests, durability, OBD checks, and OBFCM accuracy verification. Manufacturers must ensure OBFCM accuracy between −0.05 and +0.05 calculated using specified formulae comparing WLTP-determined and OBFCM-measured consumption. Conformity of production requires periodic testing and audits. Lifetime counter values shall be preserved from 1 January 2029 for new vehicle types; from 1 January 2030, type approvals for non-compliant vehicles shall not be accepted. OBFCM devices must provide standardised, unrestricted access to information via specified ISO and SAE standards.

Proposal to amend Annex B4, para. 6.2.1. to specify that three vehicles selected by the responsible authority shall cover the range of vehicles planned to be measured, and that each change of range requires new selection, but original measurements can be re-used if a vehicle is reselected, and amend para. 6.2.4. to establish approval criteria requiring the difference in cycle energy between wind tunnel method and coastdown method to be within 0.05 for each of three vehicles and within 0.02 for arithmetic average, to require approval recording, to permit facility use for two years with extension every two years upon manufacturer evidence of modifications, measurement results at three-month intervals meeting repeatability and force measurement accuracy requirements, and to require separate approval for each roller chassis dynamometer or moving belt and wind tunnel combination and each combination of wind speeds used.

UN R154 specifies unique identifiers for vehicle families in the format FT-nnnnnnnnnnnnnnn-WMI, where FT designates family type: IP for Interpolation family, RL for Road load family, RM for Road load matrix family, PR for Periodically regenerating systems family, AT for ATCT family, EV for Evaporative emissions family, DF for Durability family, OB for OBD family, ER for Exhaust after-treatment system using reagent family, GV for Gas Fuelled Vehicle family, KC for KCO₂ correction factor family, RT for Low temperature range family, MF for Monitor family, BD for Battery Durability family, VD for virtual distance family, and LP for Lower limit pressure family. The document establishes reporting requirements for fuel consumption, electric energy consumption, and fuel efficiency for various vehicle types including OVC-FCHVs and NOVC-FCHVs, with driving range of hydrogen calculated according to specified procedures.

Proposal to introduce new ⁰⁴ series of amendments to UN Regulation No. 154 establishing uniform provisions for approval of light-duty vehicles regarding emissions, carbon dioxide, fuel consumption, and electric energy consumption and range, adding requirements for State-of-Certified Range and State-of-Certified Energy monitors, Minimum Performance Requirements for batteries of OVC-HEV and PEV vehicles of categories M₁ and N₁, verification procedures for battery durability compliance, low temperature electric range testing, and updated On-Board Fuel Consumption Monitoring provisions, organized into three approval levels designated Level 1A, Level 1B, and Level 2, with Level 1A and Level 1B covering regional requirements not requiring mutual recognition and Level 2 containing harmonised procedures subject to full mutual recognition by all Contracting Parties.

Proposal to introduce provisions relating to Manipulation Devices and Strategies which were previously in the 09 series of amendments to UN R83.

Proposal to remove the provisions relating to manipulation devices and manipulation strategies as they are moved to UN R154.