This proposal aligns Annex 3, paragraph 2.3.2. with the latest amendment to ISO 5130:2012. The purpose of the amendment is to require the use of test surfaces with “no appreciable level of porosity”.

Comments from the IMMA in response to the Russian proposal to re-define the use of terms “sound” and “noise” in the motorcycle noise regulation.

Table prepared by OICA highlighting various elements in the consideration of noise in UN Regulation Nos. 9, 28, 41, 51, 59, 63, 92, and 117.