Red Lines, Zero Hour, And Green Light

Everyday we hear about Red lines, Orange lines, Zero hour, but Today we hear about The green light, What's going on with These different colors? If you drive a car You need to know about The red, orange, and the green lights, but If you don't know anything about color lights, then It's better to stay home and never drive a car, Everyday colors and may Be tomorrow spices, I don't think anyone has color blindness! Colors are colors, but if somebody can not recognize them, Then there is an another problem.