1. The Working Party on Noise (GRB) held its sixty-sixth session from 4 to 6 September 2017 in Geneva. The meeting was chaired by Mr. S. Ficheux (France). Experts from the following countries participated in the work following Rule 1(a) of the Rules of Procedure of the World Forum for Harmonization of Vehicle Regulations (WP.29) (TRANS/WP.29/690, Amend. 1 and Amend. 2): China; France; Germany; Hungary; India; Italy; Japan; Netherlands; Poland; Republic of Korea; Russian Federation; South Africa; Spain; Sweden; Switzerland and Turkey. Experts from the European Commission (EC) participated. Experts from the following non-governmental organizations also participated: European Association of Automotive Suppliers (CLEPA); European Tyre and Rim Technical Organization (ETRTO); International Council of Academies of Engineering and Technological Sciences (CAETS); International Motor Vehicle Inspection Committee (CITA), International Motorcycle Manufacturers Association (IMMA); International Organization for Standardization (ISO) and International Organization of Motor Vehicle Manufacturers (OICA).