Traffic and toll-collection use of photoelectric cells on new international bridge at Detroit; at different points on bridge approaches, photo cells indicate and register movement of cars; compared with former ticket-collection methods, this photo-cell plan has eliminated 20 men from operating payroll; details of system. (see also Eng. News Rec., vol. 104, no. 24, June 12, 1930, pp. 974-975, 3 figs.)
Photo cells control Detroit bridge traffic
Electronics
Electronics ; 1 , n 3
1930
3 pages
6 Figs.
Article (Journal)
English
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