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Why are danger signals in red although the eye is most sensitive to yellow and green?

Why are danger signals in red although the eye is most sensitive to yellow and green?Although the human eye is sensitive to yellow and green, it has become a tradition to use red as a signal for caution. A ship carrying explosives would have a red flag flying to signal to other ships not to come very close. Experts believe that since the deep red colour of blood could shock people into alertness, such a shade was most suitable as a signal for caution. Red also has the longest wavelength and it was thus believed the colour would promptly draw attention even from a distance.

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