Required luminance of red and green traffic lights was investigated under various conditions, with respect to surround; it was found that, to ensure equal perceptibility by day and night, luminance of signal must be increased 70 times; proposed electric signal control system is described.
Visibility of street traffic signals
Ueber die Sichtbarkeit von Strassenverkehrs-Signalen
Lichttechnik ; 15 , n 3
1963
4 pages
Article (Journal)
German
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