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| ASEP II | 2nd Informal Working Group on Additional Sound Emission Provisions Last session: February 2022 |
| FIT | Regulation Fitness for Automated Vehicles |
| GRBP-TFAVRS | GRBP Task Force on Automated Vehicle Regulation Screening Last session: August 2025 |
| GTRQRTV | Global Technical Regulation for Quiet Road Transport Vehicles Informal Group Last session: May 2018 |
| IG-ASEP | Real-Driving Sound Emission Provisions for M1/N1 Vehicles Last session: June 2024 |
| IWGMU | Informal Working Group on Noise Measurement Uncertainties Last session: November 2023 |
| RDASEP | Real-Driving Additional Sound Emission Provisions: Monitoring Phase 2023 Last session: July 2025 |
| RDASEPL | Real-Driving Additional Sound Emission Provisions for L-Category Vehicles Last session: December 2024 |
| SIG-AVRS | GRBP Special Interest Group on Screening of Regulations for AV Applicability Last session: January 2024 |
| TA | Task Force on Tyre Abrasion Last session: August 2025 |
| TFMU | Task Force on Vehicle and Tyre Noise Measurement Uncertainties Last session: June 2022 |
| TFQRTV | Task Force on QRTV and UN R138 02 series of amendments Last session: November 2023 |
| TFRWS | Task Force on Reverse Warning Sound Issues Last session: October 2021 |
| TFST | Task Force on Studded Tyres Last session: May 2022 |
| TFVS | Task Force on Vehicle Sound Limits Last session: July 2025 |
| TPMSTI | Task Force on Tyre Pressure Monitoring Systems and Tyre Installation Last session: July 2021 |
| TYREGTR | Informal Group on the Development of a Tyre GTR Last session: September 2019 |
| WT | Wet Grip on Worn Tyres Last session: August 2025 |