Who decided what color road signs were to be and why?

Question

Who decided what color road signs were to be and why?

Answer 1

The department of transportation..........

Answer 2

I think that the use of red to indicate stop (both on signs and on traffic lights) came from railroad trains having a red lantern on the rear to warn the train behind to stop before hitting it.

Answer 3

It is natural that when a red color comes something is in danger, also the bulls gets angry/agitataed at the sign of a

red  cloth, there are also other animals which attack when the red clothes is worn.

Based on these it RED means stop

and green is a pleasant color and soothes the eyes, so when in green the  movement begins

Amber is a mid way process to pause before stopping.

Answer 4

It was a guy named Phil. He was the only one who wanted to do it.

Answer 5

It was phil.