| UN R9 Three-Wheeled Cycle Noise | UN Regulation | UNR 0009 |
| UN R28 Audible Warning Devices and Signals | UN Regulation | UNR 0028 |
| UN R41 Motorcycle Noise | UN Regulation | UNR 0041 |
| UN R51 Vehicle Noise Emissions | UN Regulation | UNR 0051 |
| UN R59 Replacement Silencing Systems | UN Regulation | UNR 0059 |
| UN R63 Two-wheeled Moped Noise | UN Regulation | UNR 0063 |
| UN R92 Replacement Exhaust Silencing Systems for Motorcycles | UN Regulation | UNR 0092 |
| UN R117 Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance | UN Regulation | UNR 0117 |
| Quiet Road Transport Vehicles | Regulatory Project | QRTV-GTR |
| UN R0 International Whole Vehicle Type Approval System (IWVTA) | UN Regulation | UNR 0000 |
| Intelligent Transport Systems | ITS | |
| RE3 Construction of Vehicles | RE3 |