|
4.
|
Regulation No. 51 (Noise of M and N categories of vehicles)
|
|
4. (a)
|
UN R51 Development
|
|
4. (b)
|
Additional sound emission provisions
|
|
7.
|
Regulation No. 117 (Tyre rolling noise and wet grip adhesion)
|
|
9.
|
Exchange of information on national and international requirements on noise levels
|
|
12.
|
Definitions and acronyms in Regulations under the responsibility of GRB
|