The objective of the research was to evaluate the performance of two advance detection designs used by the Nebraska Department of Roads (NDOR) to provide dilemma zone protection on high-speed approaches to signalized intersections on the state highway system. One design was the conventional design used by NDOR, and the other was a new design. The conventional design consists of a series of detectors, which enable vehicles to extend the green as they travel through the dilemma zone and prevent the onset of yellow while they are in the dilemma zone. The new design has advance detection at one location and active advance warning signs with the legend PREPARE TO STOP WHEN FLASHING, which are interconnected to the traffic signal so that the beacons are activated at a predetermined time before the onset of yellow. Field studies indicated the designs performed equally well with respect to drivers stopping abruptly, running the red light, and accelerating on the yellow. However, the new design did have a significantly lower than expected percentage of vehicles in their dilemma zones at the onset of yellow.


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    Title :

    Advanced Detection on High-Speed Signalized Intersection Approaches


    Contributors:
    P. T. McCoy (author) / G. Pesti (author)

    Publication date :

    2002


    Size :

    118 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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