Description of device developed in California which is installed on traffic lights and diffuses light from signal so that all light was cut off within vertical distance of 5 ft when viewed 500 ft from signal. (See also Calif Highways and Pub Works v 20 n 8 Aug 1942 p 4-5 and 20)
Highways division designs new traffic signal blackout unit
Am Highways
American Highways ; 21 , n 4
1942
3 pages
Article (Journal)
English
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Highways division designs new traffic signal blackout unit
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