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South of Tucson, Arizona, all road signs are in the Metric System.

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By fedral law all units on US roadways were supposed to be changed to metric many many years ago. just noone did it (chatanogaa, or however you spell it, in Tenesse has a few metric signs around it on the interstate)
This isn't true. Only one road in Arizona, Interstate 19 (I-19), which runs north/south between Tucson, AZ and Nogales, AZ/Nogales, Mexicso, is measured in kilometers, rather than miles. This is ostensibly because its south terminus is at the Mexican border. Interesting: The speed limits are still posted in miles-per-hour (MPH).

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