Traffic signs come in all sizes, shapes, and colors, but there is some standardization, which has to do with how important the message is. The STOP sign is the only one that has a octagonal shape, which was standardized in the United States 1923. They are also red, which was standardized only in the 1950s. Now all stop signs are red, except for some in Hawaii. And there are reasons for the unique octagonal shape of the stop sign, which you can read about at Now I Know. -via Digg
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