Question

why traffic light has only red, green and yellow colour​

Answer 1

Answer:

They chose red as the color for stop because red has for centuries been used to indicate danger. The railroad decided to change it so the green light meant go and a “yellow” was chosen because the color is so distinct from the other two colors used.

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Answer 2

They chose red as the color for stop, it is thought, because red has for centuries been used to indicate danger. ... Thus, the railroad decided to change it so the green light meant go and a caution “yellow” was chosen, primarily because the color is so distinct from the other two colors used.

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