This session includes documents concerning the following regulatory subjects:

UN R51 Vehicle Noise Emissions	UN Regulation	UNR 0051
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 R138 Quiet Road Transport Vehicles	UN Regulation	UNR 0138