Police check for 12-hr. working day in 5-min. periods gives complete data of movement through busy loop district; prepunched tabulating card used in checking traffic; postal card and emergency card issued in check to drivers leaving Loop district who had entered before 7 A. M.; work went through central control office; remedial action planned.


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    Title :

    Chicago checks traffic using new card system


    Additional title:

    Elec. Traction


    Published in:

    Publication date :

    1929


    Size :

    3 pages


    Remarks:

    5 Figs.


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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