TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 399: Real-Time Traveler Information Systems explores the needs and expectations of travelers, the current status of a variety of traveler information systems in the United States, available and emerging data sources, and business models for sustaining traveler information.
National Research Council. NCHRP Synthesis 399: Real-Time Traveler Information Systems. Washington, DC: The National Academies Press, 2009.
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