IWG RD-ASEP is developing a mandatory test to assess compliance with paragraph 6.2.3 of Regulation 51.04 main body, assuring vehicle noise emission at speed, load, or acceleration conditions other than Annex 3 condition is linked to vehicle physics with no noise emission test detection or defeat device schemes. After the 13th session in June 2026, the Editing Task Force created a consolidated R51.04 draft incorporating R51.03 Supplements up to Supplement 11, with mandatory random RD-ASEP testing for approval and revised control range. Submission targets include informal document first draft September 2026, second draft February 2027, and expected working document for adoption February 2028.

Three options are presented for the document package. Option 1 proposes a Working Document to be submitted by 22 July 2026, with non-agreed items excluded from both memorandum and Informal Document, and a new section created to record non-agreement items. Option 2 proposes a Working Document submitted by 22 July 2026 and an Informal Document drafted by interest parties including Japan for submission during the 95th GRPE in October, titled Interim Guidance for A-LCA to assist practitioners with CFP calculation. Option 3 proposes a Working Document submitted by 22 July 2026 and an Informal Document produced by A-LCA IWG for submission during the 95th GRPE in October, with the same title and aim.