Why Red Light?

Most of time, when I asked some one how to get an address they mention about RED light on the traffic lamp frequently. I was thinking, why should be red light? Was there only “Red” light?  There was green and yellow too. Because of waiting time is found on the traffic light when it was “RED” and All drivers were there to ask themself when it was going to be “Green”

Maybe 80 to 20 is the ratio of Red and GREEN, do counting.

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