Abstract: Travel times on preset highway itineraries are one of the most tangible outputs of Intelligent Transportation Systems (ITS). Travel times constitute an effective metric to describe level of service on roadways. It is a fine indicator of congestion and is well understood by the traveling public. Traditionally, traffic data is collected by sensors installed at fixed locations but such traffic sensors are expensive to install and maintain, which prevents denser coverage. Private industry vendors have approached Caltrans with solutions to collect travel time data on highways and city arterials using cell‐phone based technology. This report provides a survey of technologies available to collect traffic data and a series of systematic studies to characterize the quality of travel time information and evaluate its range. It investigates point detection, probe data, and segment detection. It concludes that a fusion of the data provided by these technologies would provide the best results in terms of travel time accuracy, reliability, and relevance.
Publication Year: 2010
Publication Date: 2010-02-01
Language: en
Type: article
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