I-19 between Tucson and Nogales
Note: The Arizona Department of Transportation has said that these thirty- to forty-year-old signs need to be replaced, but a decision has not yet been made as to whether the replacements will show metric measurements.

Metric in usesign on I-19 southbound, just north of W Ajo Way, in Tucson, AZ. Photo courtesy of Chris Kobasiar, .



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