Why does red mean "stop" and green "go"?

Why did they use red and green for stop lights ?

Picture of Why does red mean
rickharris7 years ago
Red is a colour almost universally connected to danger - Possibly because of your blood being red. Green is almost universally regarded as safe - Perhaps because we see green things as food and so not any danger. Amber (yellow) is not as universal for caution and was chosen because of the good contrast with green and red. So Red = STOP - Danger Green = Go - Safe

Top answer.

LiveCrafts2 years ago

Red is a color that people normally think of as DANGER! or STOP! Green is more or a subtle and safe color.

Re-design7 years ago
That's the way the inventor set it up in the beginning.