U.S. Route 491 (US 491) is a north–south U.S. Highway serving
the Four Corners region of the United States . One of the newest designations in the U.S. Highway system, it was created in 2003 as a renumbering of U.S. Route 666 . With the 666 designation, this road was nicknamed "Devil's Highway" because of the common Christian belief that 666 is the Number of the ...