The sign is part of the official U.S. traffic catalog and establishes a restriction for those traveling on horseback.
There are many road signs one needs to be aware of, including those that feature one arrow pointing up and the other pointing down. But what does it mean?
US Route 20 starts in Boston, Massachusetts, and ends in Newport, Oregon. It's America's longest highway, measuring approximately 3,365 miles. However, nobody needs to drive for almost four days to ...
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