In this report, we present new algorithms that use transit vehicles as probes to determine traffic speeds and travel times along freeways and other primary arterials. We describe a mass transit tracking system based on automatic vehicle location (AVL) data and a Kalman filter to estimate vehicle position and speed. We also describe a system of virtual probe sensors that measure transit vehicle speeds using the track data. Examples showing the correlation between probe data and inductance loop speed trap data are presented. We also present a method that uses probe sensor data to define vehicle speed along an arbitrary roadway as a function of space and time, a speed function. We present the use of this speed function to estimate travel time given an arbitrary starting time. Finally, we introduce a graphical application for viewing real-time speed measurements from a set of virtual sensors that can be located throughout King County on arterials and freeways.


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    Title :

    AVL-Equipped Vehicles as Traffic Probe Sensors


    Contributors:
    D. J. Dailey (author) / F. W. Cathey (author)

    Publication date :

    2002


    Size :

    40 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Transit Vehicles as Traffic Probe Sensors

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    Transit Vehicles as Traffic Probe Sensors

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    Transit Vehicles as Traffic Probe Sensors

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    Transit Vehicles as Traffic Probe Sensors

    Cathey, F. W. / Dailey, D. J. | Transportation Research Record | 2002


    Transit vehicles as traffic probe sensors

    Cathey, F.W. / Dailey, D.J. | IEEE | 2001