The effectiveness of ground mounted diagrammatic signs in the context of urban multi-lane arterials leading to a freeway was evaluated. This type of guide sign provides much needed information well in advance of the interchange entrance, thus giving drivers more time to change lanes, if needed. Six highway-freeway interchanges were selected in the Greater Columbus, Ohio, area to determine the effectiveness of ground mounted diagrammatic sign designs were then installed and traffic flow videotaping was repeated. The collected video footage was automatically analyzed with Mobilizer PC. The resulting vehicle count, speed, and headway data was used as input to a closed form analytical model to determine the probability that driver could successfully change lanes as needed, prior to reaching the gore of the freeway entrance.


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    Title :

    Evaluation of Ground Mounted Diagrammatic Entrance Ramp Approach Signs


    Contributors:
    H. T. Zwahlen (author) / T. Schnell (author)

    Publication date :

    2000


    Size :

    86 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English