Apparatus invented by Danish engineer, A. O. MALVIG, consisting of special ground electric coil laid in road itself; passage of vehicle over coil sends impulse along to relay device; coil contains no movable parts, is not affected by weather or state of roads and suffers no injury by passage of vehicles over it; can also be used for signaling.


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    Title :

    Automatic traffic counter and signal control


    Additional title:

    Roads Road Construction


    Published in:

    Publication date :

    1934


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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