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| ASEP | Informal Group on Additional Sound Emissions Provisions Last session: November 2005 |
| ASEP II | 2nd Informal Working Group on Additional Sound Emission Provisions Last session: February 2022 |
| EFV | Informal Group on Environmentally Friendly Vehicles Last session: June 2011 |
| GTRQRTV | Global Technical Regulation for Quiet Road Transport Vehicles Informal Group Last session: May 2018 |
| IWG-R51/R59 | Informal Working Group on UN Regulations Nos. 51 and 59 Last session: October 2014 |
| QRTV | Informal Group on Quiet Road Transport Vehicles Last session: February 2012 |
| R41WG | Informal Working Group on Motorcycle Noise Emissions (Regulation No. 41) Last session: June 2010 |
| REG58-QRTV | Informal Working Group for the Development of a UN Regulation on Quiet Road Transport Vehicles Last session: February 2016 |
| STD | Joint GRRF/GRB informal group on Special Tyre Definitions Last session: August 2009 |
| TFRWS | Task Force on Reverse Warning Sound Issues Last session: October 2021 |
| TYREGTR | Informal Group on the Development of a Tyre GTR Last session: September 2019 |