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Signs along Interstate 19 in southern Arizona use kilometers instead of miles, a nod to the days when the U.S. stood on the verge of converting to the metric system. State officials say the current signs are losing reflectivity and should be replaced, but a plan to use stimulus dollars to do that is on hold because of community concerns.

A backlash has put the brakes on a plan to replace old metric signs with signage in miles. "The kilometers make it a little unique to this part of the country," says Don Herk. "It's something that's become part of my life." Read more»