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Traffic light colors

Transportation signal lights that usually use incandescent light sources (oil lamps are also used), and their colors are determined according to the color zones on the International Commission on Illumination chromaticity diagram. The basic requirements for color are not as many as those for preventing confusion of similar colors, so different color variations can be allowed according to the number of color types specified by the signal system. For example, when white and yellow are used as special signal light color systems, the tolerance for white is stricter than the tolerance for white specified in the system that does not distinguish between white and yellow. For example, the usage of red and green colors with different degrees of accuracy in different transportation systems is also different.

British Standard No. 1376 in 1953 included regulations in this regard. However, the use of colored light sources (such as red neon signal lights and yellow sodium lamps used for airport landing signals) and the need to increase the transmittance of color filters to increase the signal luminous intensity under poor visibility conditions have increased the complexity of the above problems. At present, the International Commission on Illumination and the British Standards Association are both working on compiling new regulations. In the future, it is very likely that the boundaries of green, white and yellow will be expanded, while the boundaries of blue and red will be slightly narrowed.

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