The agenda covers the 13th session of the Informal Group for Real Driving Additional Sound Emission Provisions, held June 10-12, 2026, in Gothenburg, Sweden. Topics include RD-ASEP Terms of Reference from GRBP 78th Session (GRBP-78-13), R51 matters including procedural update (GRB-68-03), Analysis Task Force Report, Editing Task Force Report, R51.04 Issues List Review, draft R51.04 text review, Inside Boundary Condition discussion, and Outside Boundary Condition discussion. The next meeting is scheduled for August 31–September 1 in Geneva, Switzerland.

The Data Analysis task force met with limited participation from Japan, Netherlands, and the pilot. The group reviewed corrections made to vehicle load issues and reference speeds. They determined that corrections to PMR and L_urban calculations would be too time-consuming without adding substantial benefit and are not currently used by the model. A proposal for generic reference acceleration determination requires further assessment, as initial analysis indicates the formula overestimates acceleration potential. The data review process should be closed, so the official work with the database can start.

The Task Force Data Analysis has almost completed data revision for RD-ASEP specifications, identifying inconsistencies and proposing corrections. Key considerations include: updating database limits to UN R51.03 phase 3, clarifying vehicle reference speed interpretation, correcting reported loads exceeding 100%, selecting correct parameter tables, defining run interdependency, strengthening tyre rolling sound specifications, resolving minimum dynamic calculation inconsistencies, improving gear shifting detection, reconsidering sound level maximum basis, increasing performance validity threshold, accepting runs outside control range with manufacturer agreement, and reviewing AVAS term application for hybrid vehicles.

The Task Force Data Analysis agenda covers welcome and agenda adoption; review of meeting schedule with sessions scheduled through June 2026; discussion of actions and considerations for the IWG and Editing group; review of vehicle review list Version 19; database status and release timing; decisions and work for subsequent meetings; and closing remarks.

The Task Force Data Analysis completed data revision for RD-ASEP specifications, identifying errors and inconsistencies. The document lists considerations for database improvements, including updating limits to UN R51.03 phase 3, clarifying vehicle reference speed definitions, correcting reported loads exceeding 100%, selecting correct parameter tables, and addressing gear shifting detection. Additional recommendations involve determining acceptable factor x ranges, resolving minimum dynamic calculation inconsistencies, increasing va_MAX validity thresholds, and reconsidering AVAS term applicability for hybrid vehicles.