[Answer] What is the only road in the U.S. with metric road signs?

Step 1 : Introduction to the question "What is the only road in the U.S. with metric road signs?"

...1. Interstate 19, Arizona 2. Interstate 27, Texas 3. Interstate 15, California 4. Interstate 10, Florida

Step 2 : Answer to the question "What is the only road in the U.S. with metric road signs?"

Interstate 19, Arizona - The United States is one of only three nations not to use the metric system — but in the 1960s, that almost changed. That decade saw the last major movement to adopt the metric system in the U.S., with some publications warning of a 1930s-era depression should the U.S. continue to resist the metric system. The Metric Conversion Act, to make metric the preferred system of measurement, finally passed Congress in 1975. Soon after, the federal government started testing road signs in kilometers instead of miles on select highways — including Interstate 19, which links Mexico to Tucson, Arizona. Eventually, anti-metric politics won out and the movement died. But the metric road signs remained on Interstate 19, leaving it the lone U.S. highway with distances listed solely in kilometers.:

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