Traffic lights colors: How do they come up to choose Red, Yellow, Green?

I followed the link that provided by kacana and there I found the answer. It said they speculate that the basis of using 3 identified colors that now we see on traffic lights is color symbolism that evoke different emotions to human. Red generally symbolizes danger or warning, making it good choice for "stop". Green is calming to us, probably because it is prolific in nature and a sign of health and abundance, therefore its good for "go". While yellow on the other hand is associated with warmth, happiness, and sun. Despite this connotation, it was chosen to symbolize "caution". Perhaps it contrasts well with green and red, and is highly visible without being to harsh on the eye of motorists. The article doesn't state why other countries like Ireland has a color orange on their stop lights.

Thanks for the link. Now I've got enough information why traffic lights have that three colors specifically. Thanks bro.

Well okey then at least you add some information about my query. Thanks for your sharing. I guess they add yellow because when the green lights flash the motorist still not ready to move so it takes additional time so they yellow light will be the reminder that they should be ready to go because the next light will flash is green.

Can you add some information on how it can be connected to color-blinded people. Since if you are color blind then there's no use to add another color cause I wont add your recognition to the first one.