The Institution of Highways and Transportation
Science, Technology, Transportation, Institutes - The Institution of Highways and Transportation. IHT aims to provide a forum for the exchange of technical information and views on highways and transport policy.
http://iht.org/
Institute of Transportation Engineers -- ITE
The Institute of Transportation Engineers is an international individual member educational and scientific association. ITE members are traffic engineers, transportation planners and other professionals who are responsible for meeting society's needs for safe and efficient surface transportation through planning, designing, implementing, operating and maintaining surface transportation systems worldwide.
https://www.ite.org/
Pennsylvania Transportation Institute
Science, Technology, Transportation, Institutes - Pennsylvania Transportation Institute. The Pennsylvania Transportation Institute is an interdisciplinary research unit at Penn State with focus on pavements, materials and construction.
http://pti.psu.edu/
University of Michigan Transportation Research Institute
Science, Technology, Transportation, Institutes - University of Michigan Transportation Research Institute. Broad areas of research include crash-data collection and traffic-safety analysis, bioengineering, human factors, mechanical engineering, psychology, economics, public policy, and marine systems.
https://www.umtri.umich.edu/