AN ELECTRIC WARNING
Installed on an American highway, a new photo-electric devices flashes on an electric sign that warns motorists who are exceeding the speed limit. Cars racing down a road interrupt the beams of two "electric eyes." Automatic timers check car speed between the two beams; if it exceeds the limit, the electric warning sign flashes on. The apparatus is expected to prove especially valuable near dangerous curves and intersections.
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https://paperspast.natlib.govt.nz/newspapers/EP19370605.2.14
Bibliographic details
Evening Post, Volume CXXIII, Issue 132, 5 June 1937, Page 6
Word Count
71AN ELECTRIC WARNING Evening Post, Volume CXXIII, Issue 132, 5 June 1937, Page 6
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