Description of device developed in California which is installed on traffic lights and diffuses light from signal so that all light was cut off within vertical distance of 5 ft when viewed 500 ft from signal. (see also Am Highways v 21 n 4 Oct 1942 p 11-3)


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    Title :

    Highways division designs new traffic signal blackout unit


    Additional title:

    Calif Highways Pub Works


    Contributors:


    Publication date :

    1942


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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