Contributions of Transportation Network Modeling to the Development of a Real-Time Route Guidance System

The choices facing most urban travelers concerning frequently — made trips, such as the daily journeys to and from work, pertain to the route of travel and the time of departure. Some of these travelers may also consider the choice of mode, if indeed a choice is available to them. The basis for these choices largely consists of the traveler’s experience with the performance of specific travel choice combinations selected during past excursions. Even this experience, however, is gained sequentially as a series of related events; real opportunities to compare the performance (e.g. travel time, cost, comfort, etc.) of alternative choices of routes and departure times are rarely available. Since travel conditions vary markedly from hour to hour, as well as day to day, this sequential experience provides only a rough guide to the traveler, and offers little opportunity for ex post comparison with discarded choice alternatives.

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