(a) What color combinations are used for regulatory signs (e.g. speed limit signs) and for general warning signs (e.g. advance railroad crossing signs)? (b) Why are these combinations used?
What will be an ideal response?
Regulatory signs use a color combination of black lettering on white
background, and most advance warning signs use the color combination of black
lettering on yellow background. These color combinations are used because they
have been shown to be those to which the eye is most sensitive.
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