Validation and augmentation of Inrix arterial travel time data using independent sources.
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2015-02-01
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Abstract:Travel time data is a key input to Intelligent Transportation Systems (ITS) applications. Advancement in vehicle
tracking and identification technologies and proliferation of location-aware and connected devices has made network-wide travel time data available to transportation management agencies. The trend started with data collection on
freeways has been quickly extended to arterials. Although freeway travel time data has been validated extensively in
recent years, the quality of arterial travel time data is not well known. This project presents a comprehensive validation
scheme for arterial travel time data based on GPS probe and Bluetooth generated data as two independent sources.
Since travel time on arterials is subject to a higher degree of variation compared to freeways mainly due to presence of
signals, a new validation methodology based on coefficient of variation was introduced. Moreover, a Context
Dependent (CD) based travel time fusion framework was developed to improve the reliability of travel time
information by fusing data from multiple sources. The entire 2012 data on a busy arterial corridor consisting of six
segments in Maryland was used to demonstrate the proposed comparison and augmentation model.
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