Object of controller described is to keep signal green on major street and to give green signal to minor street only when requested; minor street vehicle can always get green signal after short wait, while major street receives green light for as much extra time as minor street traffic permits; focussed light beam, phototube unit, relay panels, and associated circuits are described. (See also Am. Inst. Elec. Engrs. -- Advance Paper no. 34, Jan. 26-30, 1931 6 pp., 12 figs, Engrs. and Eng. v 49 n 2 Feb. 1931 p 44-45)
Traffic control by light beams for major-minor intersections
Elec. Eng
Electrical Engineering ; 50 , n 3
1931
3 pages
7 Figs.
Article (Journal)
English
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Traffic control by light beams for major-minor intersections
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