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.
Chicago checks traffic using new card system
Elec. Traction
Electric Traction ; 25 , n 6
1929
3 pages
5 Figs.
Aufsatz (Zeitschrift)
Englisch
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