Highway system in South Korea

South Korea has seven highway systems.^[1]

1. National expressways (Korean: 고속국도; Hanja: 高速國道; RR: Gosokgukdo)
2. General national highways (Korean: 일반국도; Hanja: 一般國道; RR: Ilbangukdo)
3. Special Metropolitan City roads and Metropolitan City roads [ko] (Korean: 특별시도·광역시도; Hanja: 特別市道·廣域市道; RR: Teukbyeolsido·Gwangyeoksido)
4. Local highways (Korean: 지방도; Hanja: 地方道; RR: Jibangdo)
5. Si roads (Korean: 시도; Hanja: 市道; RR: Sido)
6. Gun roads (Korean: 군도; Hanja: 郡道; RR: Gundo)
7. Gu roads (Korean: 구도; Hanja: 區道; RR: Gudo)