The Informal Working Group on EV/HFCV Retrofit Systems held its eighth meeting on 21 April 2026. The group discussed cybersecurity principles, requiring retrofitted vehicles not to reduce safety or cybersecurity performance compared with UN R155 requirements, with differentiated approaches for base vehicles approved or not approved to UN R155. Braking compliance, EMC testing references, and UN draft regulation changes including renaming to “vehicles intended to be transformed into pure electric vehicles” and introducing Electric Powertrain Retrofit Systems definitions were addressed. PTI-related aspects and the need for written contributions were highlighted before providing the draft regulation to GRPE in October.

This document is a draft Guidance and Interpretation Document (GID) for UN Global Technical Regulation and UN Regulation on Automated Driving Systems, based on GRVA/2026/3 as amended by GRVA-24-29 and WP.29-198-09. The GID provides explanatory text, guidance, and examples to support implementation of ADS requirements without introducing new obligations. It covers scope, definitions, application for approval, approval procedures, ADS performance requirements in nominal, critical, and failure situations, interactions between ADS and users, safety management systems, test environments including simulation credibility frameworks, safety case requirements, post-deployment safety monitoring with reportable occurrences, and compliance assessment procedures. The document clarifies terminology including operational states of ADS features, critical occurrences, driving situations, and mitigated risk conditions, and provides detailed guidance on ODD definition, safety case structure, confirmatory testing approaches, and in-service reporting templates with threshold definitions for critical occurrences.

The session is scheduled for May 19, 2026, from 05:30 to 08:00 EDT. The agenda includes discussion of UN GTR 22 and UN GTR 25 regulatory topics covering conditioning cycles, SOCE readiness monitor, MPRs, SOCR, mutual recognition, FCEVs, highly integrated systems, efficient test methods, OICA comments, MPRs and energy throughput, normal usage indices, Part C virtual distance verification, Annex 2 alternative test method, and battery replacement provisions. UN GTR 25 Amendment 2 must be submitted to March 2027 GRPE by December 2026 deadline.

Proposal to define service life values by region or country of usage, establish methodology for calculating realistic GHG emissions and energy consumption during vehicle use stage at various detail levels, determine discrepancy factors based on real-world performance data, apply deterioration factors to account for vehicle aging effects, quantify leakage emissions including hydrogen and methane, assess maintenance and consumables impacts through manufacturer-provided frequency data or alternative methodologies, and collect primary and secondary data on driving activity, vehicle lifetime, fuel consumption, and maintenance replacement intervals. Service life values for passenger cars shall align with average age of vehicles at point of recycling within the same country, with regional default values provided in Annex 1 to the Resolution.

Proposal to define service life values by region or country of usage, establish methodology for calculating realistic GHG emissions and energy consumption during vehicle use stage at various detail levels, determine discrepancy factors based on real-world performance data, apply deterioration factors to account for vehicle aging effects, quantify leakage emissions including hydrogen and methane, assess maintenance and consumables impacts through manufacturer-provided frequency data or alternative methodologies, and collect primary and secondary data on driving activity, vehicle lifetime, fuel consumption, and maintenance replacement intervals. Service life values for passenger cars shall align with average age of vehicles at point of recycling within the same country, with regional default values provided in Annex 1 to the Resolution.

The draft agenda for the 5th meeting of Task Force 4 Frontal Impact & Restraint System Requirements is scheduled for June 25, 2026, online from 12.00 to 14.00 CET. The meeting will cover approval of the agenda and previous minutes, review of the progress dashboard, presentations of updated studies on abdominal injuries and rear row, continued discussion on priorities, a workshop in Japan, conclusions, next steps, the next meeting, and any other business.

The EqOP-TF4 held its 4th meeting on 14 April 2026 with 28 participants. BASt presented an updated GIDAS analysis of abdominal injuries in belted occupants with single major impacts. The Swedish Transport Agency presented an updated study on occupant abdominal trauma including pelvic fractures and injury severity by age and seatbelt effects. OICA presented French collision data from 2012 to 2024 showing rear seats are significantly less utilized and the front row represents 96% of fatalities and most serious injuries in M₁ passenger cars. The Chair and secretary will compile input on priorities. The next meeting is scheduled for 25 June 2026, with an in-person workshop planned for 4–6 November 2026 in Japan.