The Working Party on Noise and Tyres held its eighty-fourth session from 2-4 September 2026 in Geneva. GRBP adopted a draft new Supplement to the 02 series and a draft new Supplement to the 04 series of amendments to UN R117, and agreed to submit these to WP.29 and AC.1 for consideration and vote at their March 2027 sessions. GRBP adopted the content of a proposal for a new supplement to UN R64 and agreed to postpone submission to WP.29 until further notice. GRBP adopted revised Terms of Reference for the IWG on Real Driving-Additional Sound Emission Provisions with extended mandate until February 2028.

Proposal for a Guideline regarding the Interpretation of Paragraph 6.2.3. ASEP in the 03 series of amendments to UN Regulation No. 51, updating Informal Document GRB-68-03 and based on GRB/2005/5 and GRB/2010/9. Part A addresses internal combustion and hybrid vehicles when the combustion engine is operating, defining typical on-road driving as vehicle speeds between 15 km/h and 100 km/h, accelerations not exceeding 2 m/s² and vehicle performance not exceeding 35 m/s², and engine speeds of at least 1.5 times idle speed and not exceeding the maximum outlined in Annex 7. Significant deviation means sound level exceeding reference values by at least 6 dB(A). Type approval test results derive from Annex 3 or Annex 7 values, with reference values established using regression curves or calculation principles. Part B addresses electric and hybrid vehicles propelled electrically only, extending guidance to electrified vehicles and Enhanced Exterior Sound introduced by Supplement 11. Typical on-road driving for electric vehicles includes vehicle speeds greater than 0 km/h and up to 100 km/h and standstill covered by UN-R 138. Significant deviation for electric vehicles is at least 3–6 dB(A).

Proposal to establish revised terms of reference for IWG RD-ASEP covering vehicles of categories M₁, N₁, and L₃. For M₁ and N₁ vehicles, objectives include modifying current regulations to mandate revised RD-ASEP, updating Annex 9, deleting Annex 7, and developing coordination between UN R51 and UN R138. For L₃ vehicles, objectives include updating RD-ASEP limits. The IWG shall be chaired by Germany with OICA and IMMA as secretaries, shall report to GRBP, and shall present comprehensive proposals for M₁ and N₁ by February 2028.

Proposal to improve the readability of the text by using only the wording “run flat tyre”, mentioning the alternative wording “ self supporting tyre” in a note.