1. The Working Party on Noise (GRB) held its fifty-fifth session from 7 (afternoon) to 9 (morning) February 2012 in Geneva. The meeting was chaired by Mr. Ch. Theis (Germany). 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 and Amend.1): Belgium; Canada; Denmark; China; France; Germany; Hungary; India; Italy; Japan; Netherlands; Norway; Poland; Republic of Korea; Russian Federation; Spain; Sweden; Switzerland; Turkey; United Kingdom of Great Britain and Northern Ireland and United States of America (US). Expert from the European Commission (EC) participated. Experts from the following non-governmental organizations also participated: European Association of Automobile Suppliers (CLEPA); International Motorcycle Manufacturers Association (IMMA); International Organization for Standardization (ISO); International Organization of Motor Vehicle Manufacturers (OICA). Upon the special invitation of the Chair, experts from the following non-governmental organizations participated: European Tyre and Rim Technical Organization (ETRTO); International Motorcycling Federation (FIM); World Blind Union (WBU).