Proposal to establish revised terms of reference for the IWG RD-ASEP covering vehicles of categories M₁, N₁, and L₃. The group shall modify current regulations to mandate revised RD-ASEP, update Annex 9, delete Annex 7 and update relevant paragraphs in the main body and Annex 3 of UN R51, develop limit curves for different riding situations in UN R41-05, consider relevant transitional provisions, and develop coordination between UN R51 and UN R138. The IWG shall be chaired by Germany with OICA as Secretary for M/N categories and IMMA for L category, and shall present a working document for M₁ and N₁ vehicles by February 2028.

Meeting minutes from the GRBP Informal Group RD-ASEP held August 31–September 2026 in Berlin, Germany. The group reviewed the status report to GRBP, an issues list, and draft text for UN R51.04. OICA presented a document on the sensitivity of RD-ASEP results and difficulty of assessing worst case vehicle. The Secretary presented updated terms of reference to GRBP for approval. Experts are requested to submit all documents a minimum of 7 days prior to any IWG meeting date.