it was extended to Beaufort, South Carolina, and again in 1953 to its current southern terminus at the Atlantic Coast at Hunting Island State Park, between the city of Beaufort and Fripp Island. In the Interstate Highway era much of US 21 became an obvious corridor for a long-distance expressway. The West Virginia Turnpike between Charleston, West Virginia, and Princeton, West Virginia, was the first segment of a planned series of toll highways along or near US 21 from Cleveland to Charlotte, North Carolina. All of the other toll highways were shelved in favor of freeways built with Interstate funding; these freeways and the West Virginia Turnpike became I-77, which completely supplanted old US 21 as a long-distance through route. I-77 was later extended to Columbia, South Carolina, also within a few miles of US 21. Between Cleveland and Charleston, all but a relatively short segment of US 21 was completely deleted in favor of I-77, the relics being State Route 21 (SR 21), SR 821 between Byesville and Marietta, Ohio, and Guernsey County Road 35 and Tuscarawas County Road 3 (Salt Fork Road), named Old Twenty-One Road and closely follows the route of US 21 from Byesville, Ohio to the village of Newcomerstown, Ohio. County Road 35 briefly becomes a variety of street names as it passes through Cambridge, such as Byesville Road, North Avenue, 11th Street, and Clark Street, before reverting to Old Twenty-One Road on the north side of Cambridge. From there, much of the old US 21 is still intact, however, some sections were demolished and redirected in favor of I-77. Once crossing the Guernsey/Tuscarawas county line, it becomes Salt Fork Road for about a mile, before joining Ohio State Route 258, which takes it the rest of the way to Newcomerstown. In total, the entire section of Old Twenty-One Road between North Cambridge and Newcomerstown is a total of 22.5 miles. The section of US 21 between Mineral Wells and Charleston is now signed as County Route 21 in all four counties along the route (Wood, Wirt, Jackson, and Kanawha). Between Charleston and its current northern terminus at Wytheville, Virginia, almost all of US 21 coincided with either US 60, US 19, or US 52, which remained as US 21 was deleted. The short segment of US 21 in southern West Virginia not coinciding with another U.S. Highway became an extension of West Virginia Route