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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.
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).
US 76 at the North Carolina state line near Nichols: 1926: current Longest US Highway in the state, going east-west; it connects the cities Anderson, Columbia, Sumter, and Florence. US 78: 142.207: 228.860 US 1 / US 25 / US 78 / US 278 / SR 10 / SR 121 / SC 121 at the Georgia state line near North Augusta: Line Street in Charleston: 1926
US 1 / US 25 / US 78 / US 278 / SR 10 / SR 121 at the Georgia state line south of North Augusta: US 21 / SC 322 in Rock Hill: 1964: current Third form; northern part of a multi-state highway that also exists in Florida and Georgia SC 122 — — SC 2 in Cayce: US 1 / US 21 / SC 2 / SC 5 / SC 43 / SC 215 in West Columbia: 1942
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...
North Carolina Maps: State Highway Maps – State transportation maps from 1916 to 2000, hosted at the University of North Carolina Chapel Hill Libraries. 1941 General Drafting (Esso) map of North Carolina and South Carolina – TwinsMetsFan ( talk · contribs )
In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
The following is a list of the 3,143 counties and county-equivalents in the 50 states and District of Columbia sorted by U.S. state, plus an additional 100 county-equivalents in the U.S. territories sorted by territory.