Initially constructed in segments, I-40 in Tennessee was mostly complete by the latter 1960s. It has interchanges and concurrencies with four other mainline Interstate Highways in the state and has five auxiliary routes: I-140, I-240, I-440, I-640, and I-840. Route 70 (US 70) corridor for its entire length in Tennessee. Landscapes on the route vary from flat, level plains and swamplands in the west, to irregular rolling hills, cavernous limestone bluffs, and deep river gorges in the central part of the state, to plateau tablelands, broad river valleys, narrow mountain passes, and mountain peaks in the east. It crosses all of Tennessee's physiographical provinces and Grand Divisions-the Mississippi embayment and Gulf Coastal Plain in West Tennessee, the Highland Rim and Nashville Basin in Middle Tennessee, and the Cumberland Plateau, Cumberland Mountains, Ridge-and-Valley Appalachians, and Blue Ridge Mountains in East Tennessee. I-40 passes through Tennessee's three largest cities- Memphis, Nashville, and Knoxville-and serves the Great Smoky Mountains National Park, the most visited national park in the United States. At 455.28 miles (732.70 km), the Tennessee segment of I-40 is the longest of the eight states through which it passes, and the longest Interstate Highway in Tennessee. In Tennessee, I-40 traverses the state from west to east, from the Mississippi River at the Arkansas border to the northern base of the Great Smoky Mountains at the North Carolina border. Interstate 40 ( I-40) is part of the Interstate Highway System that spans 2,556.61 miles (4,114.46 km) from Barstow, California, to Wilmington, North Carolina. Shelby, Fayette, Haywood, Madison, Henderson, Carroll, Decatur, Benton, Humphreys, Hickman, Dickson, Williamson, Cheatham, Davidson, Wilson, Smith, Putnam, Cumberland, Roane, Loudon, Knox, Sevier, Jefferson, Cocke I-40 at the North Carolina state line near Hartford I-240 / Sam Cooper Boulevard in Memphis.
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