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InternationalRecreationalRegionally Symbolic Tunnel Portals at Expressway

Kyong-Ku Yun, Yong-Gon Kim, and Sung-Yong Choi

Since the construction of the first expressway in the 1970s, the total length of expressways in Korea has increased to 2757 miles (4437 km), of which 542 miles (872 km) include 1055 tunnels.