United Nations Economic Commission for Europe (UNECE): Transport, Health and Environment Pan-European Programme

AIPCR / PIARC , l'Association mondiale de la route / World Road Association / Asociación mundial de la Carretera. "The World Road Association (PIARC) is a non-political and non-profit making association. It was granted consultative status to the Economic and Social Council of United Nations in 1970." (English, Français, Español).

ECTRI, the European Conference of Transport Research Institutes is an international non-profit organisation that was founded in April 2003. Its members are 26 major transport research institutes or universities from 19 European countries. Together, they account for more than 4000 European scientific and research staff in the field of transport.

FEHRL, Forum of European National Highway Research Laboratories is a registered International Association with a permanent Secretariat based in Brussels. It provides a coordinated structure for the interests of over thirty national research and technical centres from Europe, together with associated institutes from around the world. FEHRL is engaged in road engineering research topics including safety, materials, environmental issues, telematics and economic evaluation. Research capacity is provided by the national institutes and makes use of the wide range of test facilities available to them.

OECD, Organisation for Economic Co-operation and Development

IRU, International Road Transport Union

UIC, International Union of Railways

IAPH, the International Association of Ports and Harbors

ITA-AITES, International Tunnelling and Underground Space Association / Association Internationale des Tunnels et de l'Espace Souterrain.

IKSR / CIPR / ICBR / ICPR, International Commission for the Protection of the Rhine

ICAO, International Civil Aviation Organization

IMO, International Maritime Organization

UIRR, Union Internationale des sociétés de transport combiné Rail-Route / the International Union of Combined Road-Rail Transport Companies.

WHO, World Health Organization, Regional Office for Europe, Transport and health.

WMO, World Meteorological Organization.

ITF, International Transport Workers' Federation

IATR, International Association of Transportation Regulators. IATR was formed to establish a professional association of municipal, county, state, country, provincial, or federal transportation regulators who are directly or indirectly responsible for the regulation of transportation industries. IATR is a growing peer group of taxi, limousine and for-hire transportation regulators, dedicated to improving the practice of licensing, enforcement and administration of for-hire transportation through the sharing of information and resources.

IARO International Air Rail Organisation (rail links to airports). Organisations planning, developing, building and operating rail air links.

The International Association for Travel Behaviour Research (IATBR) is an international organization of scholars, researchers, practitioners, consultants, and public agency professionals dedicated to the advancement of travel behaviour research.