There are some Special Metropolitan City roads in Seoul (Hangul: 서울특별시도; Hanja: 서울特別市道; RR: Seoulteukbyeolsido). Basically in South Korea, urban municipalities maintain and designate highway routes. In Seoul, some of these routes are designated as motorways not allowed to walk. The numbering system of Seoul is complicated than the others: official number and guide number. Basically, official numbering system is used in the legal system only, while guide numbering system is used not only for the signage system, but also widely in public.
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Classification
There are three types of Special Metropolitan City roads of Seoul: urban expressways (Hangul: 도시고속도로), trunk routes (Hangul: 주간선도로), and auxiliary routes (Hangul: 보조간선도로).
Urban expressways
There are 8 routes; some of them are overlapping with each others.