TRB's Transit Cooperative Research Program (TCRP) Report 134: Transit, Call Centers, and 511: A Guide for Decision Makers explores the operational characteristics of 511 telephone traveler information systems and examines how 511 systems interact with transit system call centers. This report inventories existing 511 systems throughout the country, documents the extent of transit participation and transit agency experiences with 511, and presents guidance to assist transit agencies and 511 system administrators in determining a transit-511 telephone strategy.
National Research Council. TCRP Report 134: Transit, Call Centers, and 511: A Guide for Decision Makers. Washington, DC: The National Academies Press, 2009.
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