In vehicle actuated system green signal periods vary automatically from one cycle to next according to current volume of traffic passing through intersection; particular feature of Ericsson system is use of electric cable detectors installed under road surface, unexposed to wear from passing vehicles; life of detectors -- which are normally most heavily taxed components in road signal plant -- is practically unlimited.
Vehicle-actuated traffic signals at Sodertaljevagen-Sockenvagen, Stockholm
Ericsson Rev
Ericsson Review ; 36 1
1959
4 pages
Aufsatz (Zeitschrift)
Englisch
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