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State Road Number Signs

Prior to the late 1920's, most roads in the U.S., including interstate routes, had names rather than highway numbers, and it was not until 1926 that a uniform road numbering system was devised and agreed upon by the various states. New Mexico began erecting its road number signs in December of that year. Those from the 1920s and 1930s are identified by the smaller central circle in the zia and the red-and-black-on-yellow color scheme. Later ones have a larger zia circle and a white background for easier readability.


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