Traffic signals at intersections in urban areas and their interrelationship with each other; installation of new type master radio signal control headquarters at Washington, DC, to supervise isolated intersections by radio and tie them into downtown wire system; system makes it possible for one master controller to supervise 780 intersections by combined radio and underground wire.
Centralized control of metropolitan signal system
Article (Journal)
Engineering Index Backfile | 1930
Engineering Index Backfile | 1930
Pere Marquette installs centralized control signal system
Engineering Index Backfile | 1928
Pere Marquette installs centralized control signal system
Engineering Index Backfile | 1928