Automobiles crossing bridge over Mississippi River at Cairo, Ill, are counted and reported to toll house by means of totalizing installation which disregards foot passengers; two light beams and two photocells are used, horizontal beams being projected at angle rather than directly across bridge right-of-way.
Counting traffic
Electronics
Electronics ; 7 , n 9
1934
Article (Journal)
English
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NTIS | 1972
Engineering Index Backfile | 1961
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|Radio controlled traffic counting
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