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When originally established in the 1920s, the state highway system was highly organized: two-digit routes ending in "0" were major cross-state routes, other two digit routes were numbered as spurs off of the main route (that is, Highway 54 would have been a spur off of Highway 50) and lesser important routes were given three digit numbers by appending an extra "ones" digit to the two digit ...
If a new highway is established that would have the same number as a state highway, the state highway number usually changes. North Carolina grants exceptions to this rule in limited cases. Sometimes, as in NC 540 / I-540 ; the two routes are given the same number because they are seen as a continuous route.
There are 21 Interstate Highways—8 primary and 13 auxiliary—that exist entirely or partially in the U.S. state of North Carolina.As of January 2020, the state had a total of 1,410 miles (2,270 km) of Interstates and 70 miles (110 km) of Interstate business routes, all maintained by the North Carolina Department of Transportation (NCDOT).
Longest numbered route in North Carolina. US 70: 488.0: 785.4 US 25/US 70/SR 9 at the TN state line: School Drive in Atlantic: 1926: current US 74: 451.8: 727.1 US 64/US 74/SR 40 at the TN state line: Turnaround in Wrightsville Beach: 1926: current US 76: 80.4: 129.4 US 76 at the SC state line: Water Street in Wrightsville Beach: 1934
North Carolina Highway 12 (NC 12) is a 148.0-mile-long (238.2 km) primary state highway in the U.S. state of North Carolina, linking the peninsulas and islands of the northern Outer Banks. Most sections of NC 12 are two lanes wide, and there are also two North Carolina Ferry System routes which maintain continuity of the route as it traverses ...
U.S. Highway 1 (US 1) is a north–south United States Numbered Highway which runs along the East Coast of the U.S. between Key West, Florida, and the Canada–United States border near Fort Kent, Maine. In North Carolina, US 1 runs for 174.1 miles (280.2 km) across the central region of the state. The highway enters North Carolina from South ...
Interstate 40 (I-40) is a part of the Interstate Highway System that travels 2,556.61 miles (4,114.46 km) from Barstow, California, to Wilmington, North Carolina.In North Carolina, I-40 travels 420.21 miles (676.26 km) across the entirety of the state from the Tennessee state line along the Pigeon River Gorge to U.S. Highway 117 (US 117) and North Carolina Highway 132 (NC 132) in Wilmington.
Interstate 77 in North Carolina. Interstate 77 (I-77) is a part of the Interstate Highway System that runs 610.10 miles (981.86 km) from Cayce, South Carolina to Cleveland, Ohio. In the U.S. state of North Carolina, I-77 travels a total of 105.7 miles (170.1 km) from the South Carolina state line in the city of Charlotte to the Virginia state ...