As viewed by Uniform Ordinance Committee of National Conference on Street and Highway Safety; independent control; synchronized system; progressive system; present practice of cities and opinion of traffic engineers are divided between three-color and two-color; with two-color system it is generally considered necessary to overlap reds; in some cities right turns are permitted on red as on green light.
Traffic control signals
Nation's Traffic
Nation's Traffic ; 2 , n 4
1928
Aufsatz (Zeitschrift)
Englisch
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