An algorithm is presented for off-line estimation of route-level travel times for uninterrupted traffic flow facilities, such as motorway corridors, based on time series of traffic-speed observations taken from the sections that constitute a route. The proposed method is an extension of the widely used trajectory method. The novelty of the presented method is that trajectories are based on the assumption of piecewise linear (and continuous at section boundaries) vehicle speeds rather than piecewise constant (and discontinuous at section boundaries) speeds. From these assumptions, mathematical expressions are derived that describe the trajectories within each section. These expressions can be used to replace their existing counterparts in the traditional trajectory methods. A comparison of the accuracy of the new method and of the existing method was carried out by using simulated data. This comparison showed that the root-mean-square error ( RMSE) value for the new method is about half the RMSE value for the existing method. When this RMSE is decomposed in a bias and a residual error, it turns out that the existing method significantly overestimates the travel time. However, the largest part of the reduction of the RMSE value is still caused by a reduction of the residual error. In other words, if both methods are corrected for their bias, the new method performs significantly better.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Improving a Travel-Time Estimation Algorithm by Using Dual Loop Detectors


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2003-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Improving a Travel-Time Estimation Algorithm by Using Dual Loop Detectors

    van Lint, J. W. C. / van der Zijpp, N. J. / National Research Council | British Library Conference Proceedings | 2003


    Improving a Travel-Time Estimation Algorithm by Using Dual Loop Detectors

    van Lint, J. W. C. / van der Zijpp, N. J. / National Research Council | British Library Conference Proceedings | 2003



    Arterial Travel Time Estimation Using SCATS Detectors

    Cheu, Ruey Long / Liu, Qun / Lee, Der-Horng | ASCE | 2002