Traffic signal employed in all installations is of distinctive type; progressive control is accomplished by means of one central impulse-sending controller; cycle of operation of system; purpose of coordinated system of control; cost for entire system as it now stands is approximately $30,000 per year.
The Chicago traffic signal system
Armour Engr
Armour Engineer ; 19 , n 4
1928
4 Figs.
Article (Journal)
English
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