OT Stop signs
The first stop signs appeared in Detroit in 1915 - black on white. By
1922 urban signs were standardized, with different standards for urban
and rural signs. They then went to yellow in 1924, and red on yellow
in 1930.
In 1954 all stop signs in USA were white on red.
Before reflecterized signs, they used "cat's eyes" in the letters to
reflect lights.
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