Trivia: Stop Signs Weren't Always Red

Here are two bits of trivia about stop signs:

1. Stop signs originated in Michigan in 1915.
2. They weren't always red. In fact, the first stop signs were black lettering on white background. In 1924, the signs were yellow, until they were changed to red in 1954.

Link [wikipedia article on stop signs] via growabrain

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Red is actually the hardest color for the human eye to see in dim light. It's probably not a good idea to make stop signs -- or fire trucks -- red.
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