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Why are the traffic light-signals [or da...

Why are the traffic light-signals [or danger signals] of red colour ?

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In te visible spectrum, the red colour has the largest wavelength and it least scattered by fog or dust particles. Hence, it can be observed easily even in foggy and dusty conditions.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
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  13. How does the sky appear from the surface of the moon ?

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  14. What is the reason for atmospheric refraction ?

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  15. On what factor does the colour of the scattered light depend ?

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  19. What would have been the colour of the sky, in the absence of atmosphe...

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  20. Why are the traffic light-signals [or danger signals] of red colour ?

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