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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.
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes SC 1 — — Georgia state line southwest of Limehouse: SC 12 in West Columbia: 1922: 1928 SC 2: 3.940: 6.341 US 21/US 176/US 321 in Cayce: US 378 in West Columbia: 1922: current SC 3 — — SC 50 in Columbia
Inventoried by SCDOT as US 78 Conn.; signed west of SC 3, but is inventoried by SCDOT as only using these termini US 78 Conn. 0.530: 0.853 SC 3 in Blackville: US 78 in Blackville — — Is, in fact, the official designation of the signed US 78 Bus. US 78 Conn. 0.140: 0.225 SC 61 northwest of Farrell Crossroads: US 78 near Farrell Crossroads
By state law, [1] the SCDOT's function and purpose is the systematic planning, construction, maintenance, and operation of the state highway system and the development of a statewide mass transit system that is consistent with the needs and desires of the public. The SCDOT also coordinates all state and federal programs relating to highways.
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).
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
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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.