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Fred2718 t1_iy4dywh wrote

Reply to comment by Toes14 in Eli5 why do traffic lights have red, yellow and green color? Why not use other colors so that even colourblind people can drive. by [deleted]

Standardized...

Not always . There are still a few places where a horizontal layout is used.

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Toes14 t1_iy4trl9 wrote

I didn't say that the more that the horizontal layout wasn't used. But in the United States, stop lights that are laid out horizontally always have green on the right.

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