A system of computer-controlled variable message signs (matrix signs), which was implemented on many sections of the Dutch freeways, is described. The signs can display message like speed limits and 'change lane'. The main conclusions from an evaluation study are that the system reduces the number of accidents considerably, but has less influence on traffic flow. Field trials to determine optimum display features are described. These trials provided relations between the most relevant photometric quantities: horizon luminance, message luminance, pixel intensity and inter-pixel distance. Practical examples of the control of the sign's light output as a function of varying ambient light level are given.


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    Title :

    Matrix signs for motorways: systems design and optimum photometric features


    Additional title:

    Sichtzeichen fuer Kraftfahrzeugstrassen: Systementwurf und optimale photometrische Merkmale


    Contributors:

    Published in:

    Publication date :

    1988


    Size :

    6 Seiten, 5 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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