ANSWERS: 3
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It originated either with the railway system in the UK or with lighthouses.. http://en.wikipedia.org/wiki/Traffic_light#History http://www.answerbag.com/q_view/65118
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i don't know, but this is what makes sense to me, red indicates hot and green indicates cool, if you go on red you get burned, if you go on green everythings cool
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Red is usually associated with danger in nature, poisonous animals nearly always have red on them somewhere. The human eyes are also drawn to red more than any other colour, making it an obvious choice for warnings.
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