- David Volkert & Associates, Inc.
 - Providing bridge and roadway design, airports, utilities, seaports, education, and health facilities. - DKS Associates
- Transportation engineering consulting services for ground transportation.
- E.C. Driver & Associates
- Conception, project management and design engineering for roadway, bridge and bascule (movable) bridges.
- Image Sensing Systems
- Company behind Autoscope, also known as image processing or artificial vision, a technology that combines video imaging with computerized pattern recognition.
- Kittelson & Associates, Inc.
- Specialises in Transportation Planning and Traffic Engineering. Provides transportation operations, planning, and research services to gov't and private orgs.
- MINCAD Systems
- Developer of design packages for highway, airport, and intermodal pavements.
- Rekola Engineers and Surveyors, Inc.
- Clients include private developers, realtors, regional shortlines, and more.
- Tinter Associates, Inc.
- Specialising in traffic signal design, traffic impact studies, concurrency evaluations, and condemnation analyses.
- Traffic Design Group
- Specialist transportation and traffic engineering consultancy. Active in New Zealand, the South Pacific and South-East Asia.
- Trafficware
- Specialises in software that is used for modelling and designing transportation systems.
- Transit Engineering Services
- Offers test equipment, engineering, and systems for transit vehicles.
- Transit Performance Engineering: Vehicle Structural Analysis
- Offers consulting services in public transit engineering and management, preparation of technical specifications, and more.
- Transurban CityLink
- Specialises in the development and operation of advanced electronic toll roads. Developer of CityLink and the e-TAG device.
- Whitworth-Borta and Co.
- Engineering company specialising in airport design and construction projects from planning and paving to lighting.
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