1. The World Forum for Harmonization of Vehicle Regulations (WP.29) held its 175th session from 19 to 22 June 2018, 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):

1. Australia
2. Austria
3. Belgium
4. Bosnia and Herzegovina
5. Bulgaria
6. Canada
7. China
8. Czechia
9. France
10. Germany
11. Hungary
12. India
13. Italy
14. Japan
15. Luxembourg
16. Malaysia
17. Netherlands
18. Norway
19. Poland
20. Portugal
21. Republic of Korea
22. Romania
23. Russian Federation
24. South Africa
25. Spain
26. Sweden
27. Switzerland
28. Thailand
29. United Kingdom of Great Britain and Northern Ireland (UK)
30. United States of America
31. Viet Nam.

Representatives of the European Union participated. The following international organization was represented: International Telecommunication Union (ITU). The following intergovernmental organization was represented: European Union funded EuroMed Transport Support Project. The following non-governmental organizations were also represented:

1. Association for Emissions Control by Catalyst (AECC)
2. European Association of Automotive Suppliers (CLEPA/MEMA/JAPIA)
3. Consumers International (CI)
4. European Association of Internal Combustion Engine Manufacturers (EUROMOT)
5. European Tyre and Rim Technical Organization (ETRTO)
6. International Automobile Federation (FIA)
7. Global New Car Assessment Programme (Global NCAP)
8. International Automotive Lighting and Light Signalling Expert Group (GTB)
9. International Motorcycle Manufacturers Association (IMMA)
10. International Motor Vehicle Inspection Committee (CITA)
11. International Organization of Motor Vehicle Manufacturers (OICA)
12. Society of Automotive Engineers International (SAE International).

Other non-governmental organizations were represented following Rule 1(d):

1. American Automotive Policy Council (AAPC)
2. Recreation Vehicle Industry Association (RVIA)
3. World Bicycle Industry Association (WBIA).

Other non-governmental organizations, private sector entities, independent experts and observers were represented: Motor and Equipment Manufacturers Association (MEMA), Uber Technologies, Inc and U.S. Tire Manufacturers Association.