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Contact Information

Contact Information

For questions about the NGSIM program, contact:


John Halkias

Federal Highway Administration
Office of Travel Management
Room 3404, HOTM-1
400 Seventh Street, SW
Washington, DC 20590
Phone: (202) 366-2183
E-Mail: John.Halkias@fhwa.dot.gov


James Colyar
Federal Highway Administration
Office of Operations Research and Development
6300 Georgetown Pike
McLean, Virginia 22101
Phone: (202) 493-3282
E-Mail:



For questions about technical aspects of NGSIM, please contact:


Vassili Alexiadis, Principal Investigator

Cambridge Systematics
555 12th Street, Suite 1600
Oakland, CA 94607
E-Mail: valexiadis@camsys.com

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