1. The World Forum for Harmonization of Vehicle Regulations (WP.29) held its 183rd session from 9 to 11 March 2021, chaired by Mr. A. Erario (Italy). The following countries were represented, following Rule 1 of the Rules of Procedure of WP.29 (ECE/TRANS/WP.29/690/Rev.1): Armenia, Australia, Austria, Belgium, Bosnia and Herzegovina, Brazil, Canada, China, Czech Republic, Egypt, Finland, France, Germany, Hungary, India, Ireland, Israel, Italy, Japan, Latvia, Luxembourg, Malaysia, Netherlands, Nigeria, Norway, Panama, Poland, Portugal, Republic of Korea, Romania, Russian Federation, Slovakia, South Africa, Spain, Sweden, Switzerland, Tunisia, Ukraine, United Kingdom of Great Britain and Northern Ireland, United States of America and Uzbekistan. Representatives of the European Union participated. The following international organization was represented: International Telecommunication Union (ITU). The following intergovernmental organization was represented: African Organization for Standardization (ARSO). The following non-governmental organizations were also represented: Association Européenne des véhicules électriques a batteries, hybrides et à Piles à combustible, Association for Emissions Control by Catalyst (AECC), Consumers International (CI), European Association of Automotive Suppliers (CLEPA/MEMA/JAPIA) , European Federation of Road Traffic Crash Victims, European Garage Equipment Association (EGEA), Fédération Internationale des Grossistes, Importateurs et Exportateurs en Fournitures Automobiles (FIGIEFA), Global New Car Assessment Programme (Global NCAP), International Motor Vehicle Inspection Committee (CITA), Fédération International de l’Automobile (FIA), International Automotive Lighting and Light Signalling Expert Group (GTB), International Motorcycle Manufacturers Association (IMMA), International Organization of Motor Vehicle Manufacturers (OICA), International Road Transport Union (IRU), Motor and Equipment Manufacturers Association (MEMA), European Tyre and Rim Technical Association (ETRTO) and SAE International. Other non-governmental organizations were represented following Rule 1(d): American Automotive Policy Council (AAPC), Secure America’s Future Energy (SAFE) and World Bicycle Industry Association (WBIA). Other non-governmental organizations, private sector entities, independent experts and observers were represented: EuroMed Transport Support Project and European Committee for Standardization (CEN).