State Route 66 (SR 66) is a surface road in the U.S. state of Arizona in Mohave and Coconino Counties. In 1914, the road was designated "National Old Trails Highway" but in 1926 was re-designated as U.S. Route 66.[2] In 1985, U.S. Route 66 was dropped from the highway system. Parts of the highway were either absorbed into I-40, turned over to the state (SR 66), or turned over to Yavapai County.
^Cite error: The named reference AZDOT was invoked but never defined (see the help page).
^National Old Trails Highway Archived 2013-12-07 at the Wayback Machine- Retrieved 2012-02-11
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