- American Traffic Safety Services Association
 - Fredericksburg - National organisation representing companies and individuals in the traffic control business. - Messenger Courier Association of the Americas
- Organisation of 500 messenger and courier companies worldwide.
- Hazardous Cargo Bulletin
- Offering links and information relating to the transport, storrage and handling of chemicals, oils, gases and related materials.
- Williams Bus Lines, Inc.
- Springfield - Operating school buses for schools and charters in the Washington, D.C. area.
- Association of European Railways
- Provides passes for railway travel in 17 European countries.
- Transportation and Economic Research Associates, Inc. (TERA)
- Consulting firm providing services in support of client needs and requirements in all modes of transport.
- AAROTEC Group, The
- Fairfax - Infrastructure consulting and manufacturing firms with specializations in airport, port, harbour, and transportation design and development.
- Sonneville International Corporation
- Alexandria - Specialises in railway track design and related activities.
- TransManagement, Inc.
- Management consulting firm serving the transportation community.
- DBH Consulting
- Arlington - Serving the transportation sector with technical, business development, and representational services. Specialising in intelligent transportation systems.
- Transportation Management Enterprise Inc.,
- CDL training and charter bus company in the Metropolitan area.
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