Controlled-access highway
South Korea

Since Gyeongin Expressway linking Seoul and Incheon opened in 1968, national expressway system in South Korea has been expanded into 36 routes, with total length of 4,481 km (2,784 mi) as of 2017. Most of expressways are four-lane roads, while 1,030 km (640 mi) (26%) have six to ten lanes. Speed limit is typically 100 km/h (62 mph) for routes with four or more lanes, while some sections having fewer curves have limit of 110 km/h (68 mph).

Expressways in South Korea were originally numbered in order of construction. Since 24 August 2001, they have been numbered in a scheme somewhat similar to that of the Interstate Highway System in the United States. Furthermore, the symbols of the South Korean highways are similar to the US red, white and blue.
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