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There are 11 Interstate Highways—5 primary and 6 auxiliary—that exist entirely or partially in the U.S. state of South Carolina.As of December 31, 2013, the state had a total of 850.80 miles (1,369.23 km) of interstate and 11.80 miles (18.99 km) of interstate business, all maintained by the South Carolina Department of Transportation (SCDOT).
South Carolina utilizes a numbering system to keep track of all non-interstate and primary highways that are maintained by SCDOT. First appearing in 1947 [citation needed] (when a huge amount of highways were cancelled or truncated), the "state highway secondary system" [4] carries the number of the county followed by a unique number for the particular road.
Interstate 20 (I-20) is the main east–west Interstate Highway in the state of South Carolina, linking the state with important transportation and business hubs to the north, west, and south, including Atlanta, Georgia; Charlotte, North Carolina (via I-77); Savannah, Georgia (via I-95); and Washington, D.C. (via I-95).
The South Carolina Department of Transportation (SCDOT) operates and maintains one welcome center and seven rest areas along I-26. Welcome centers, which have a travel information facility on site, are located at milemarker 3 (eastbound); rest areas are located at milemarkers 63 (east and westbound), 123 (east and westbound), 150 (eastbound), 152 (westbound), and 204 (eastbound). [2]
Originally, both Carolinas selected a route running south from Rockingham, North Carolina. However, North Carolina had more money to spend on roads, [6] and, on May 10, 1995, the US Senate Environment and Public Works Committee approved North Carolina's plan for I-73 to run eastward to the coast and enter South Carolina at North Myrtle Beach. [7]
The entire route was in concurrency with US 15 in South Carolina. US 15 Conn. 2.140: 3.444 US 15 / US 301 southwest of Santee: SC 6 in Santee — — Unsigned US 15 Conn. 2.140: 3.444 US 301 in Summerton: US 15 in Summerton — — Unsigned US 15 Alt. — — Sumter: Society Hill: 1955: 1957 Replaced by US 401. US 15 Conn. 0.340: 0.547
US 1 enters South Carolina in North Augusta, along an expressway with US 25, US 78, and US 278 on a bridge over the Savannah River from Augusta, Georgia. South Carolina Highway 121 (SC 121) also begins at the state border. The expressway is known locally as the Jefferson Davis Highway. At the second interchange (E. Martintown Road), US 25 and ...
I-26 in Columbia, South Carolina: I-90 in Cleveland, Ohio: 1958: current Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio Associated route: I-277: I-78: 146.28: 235.41 I-81 at Jonestown, Pennsylvania: Canal Street in New York City: 1957: current Serves three states: Pennsylvania, New Jersey, New York
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