A method is presented for achieving many of the benefits of linking isolated signalized intersections into systems without incurring the costs of either cable installation or leased communication channels. The method may be considered an interim step where traffic reponsive systems are planned or as the final solution in situations where responsive system are not warranted. The method employs a microprocessor together with an accurate clock whose stability is based on electrical service frequency under normalconditions and on a quartz crystal and battery under power failure conditions. The traffic advantages include all those attributed to systemization but not those of traffic responsive operation. Other advantages include the initial cost, well below that of cable installation, and an excellent record of reliability and low maintenancecost.s. Development of similar device in the U.S. is reviewed briefly with a limited amount of cost comparison against the Australien unit. The equipment described offers a quicker and less costly means for setting up multiprogrammed signal systems either on an interim or permanent basis.


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    Title :

    Signal systems without cables


    Additional title:

    Kabellose Signalsysteme


    Contributors:

    Published in:

    Publication date :

    1980


    Size :

    7 Seiten, 5 Bilder, 4 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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