South Korea has a nationwide system of national highways (Hangul: 국도; Hanja: 國道; RR: Gukdo), officially called as General national highways (Hangul: 일반국도; Hanja: 一般國道; RR: Ilbangukdo), distinct from the expressways. The Ministry of Land, Transport and Maritime Affairs and other government agencies administer the national highways.
References
National highways of South Korea Wikipedia(Text) CC BY-SA