Real-time surveillance of traffic conditions on urban freeway corridors using spatially discrete presence detectors is addressed. Using a finite-dimensional (macroscopic) fluid-analog model for freeway vehicular traffic flow, an extended Kalman filter is proposed as a data-processing algorithm to obtain minimum variance estimates of spatial mean speed and density. It is shown that certain model parameters associated with available roadway capacity can be estimated on-line with a variation of the extended Kalman filter, and furthermore, that the time signatures associated with these estimates provide quantitative information concerning the presence of anomalous (i.e., incident) traffic events. Performance of the surveillance algorithm is evaluated using a detailed, multi-lane microscopic vehicle simulation which retains a stochastic mix of driver-vehicle types and passing. Complexity problems associated with the computer implementation of the extended Kalman filter are addressed, and techniques for decentralized realization are proposed.


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    Title :

    Traffic Surveillance Data Processing in Urban Freeway Corridors Using Kalman Filter Techniques


    Contributors:
    P. K. Houpt (author) / M. Athans (author) / D. G. Orlhac (author) / W. J. Mitchell (author)

    Publication date :

    1978


    Size :

    198 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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