U.S. Route 23 is a part of the U.S. Highway System that travels from Jacksonville, Florida to Mackinaw City, Michigan. In the U.S. state of Tennessee, the U.S. Highway travels 57.5 miles from the North Carolina state line, at Sam's Gap, north to the Virginia state line, in Kingsport. With a predominant concurrency with Interstate 26 , US 23 is a divided four-lane freeway that follows Corridor B of the Appalachian Development Highway System and serves as a major thoroughfare in the Tri-Cities. The entire route of US 23 in Tennessee is an interstate-grade freeway.
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