There's Just One Highway in America With All Metric Road Signs
Andy Cush · 10/07/14 04:40PM
For a brief period in the 1970s and early '80s, the U.S. tried to switch over to the metric system, despite objections from real Americans that it was "Communist" or an "Arab plot." Metrication didn't get very far, but one highway remains: Arizona's Interstate 19.