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NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP Synthesis 399 Real-Time Traveler Information Systems A Synthesis of Highway Practice Consultant DEAN DEETER Athey Creek Consultants West Linn, Oregon S ubject A reas Highway Operation, Capacity, and Traffic Control, and Safety and Human Performance Research Sponsored by the American Association of State Highway and Transportation Officials in Cooperation with the Federal Highway Administration TRANSPORTATION RESEARCH BOARD WASHINGTON, D.C. 2009 www.TRB.org