Special Metropolitan City roads of Seoul

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.

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.

Official number	Guided number	Name	Korean name	Length (km)	Note
C3	30	Seoul Inner Loop Naebusunhwan-ro	내부순환로 (내부순환도시고속도로)	40.1	overlap with National Route 46 and National Route 77
01	1	Western Highway Seobuganseon-doro	서부간선도로 (서부간선)	16.8	overlap with National Route 1 and National Route 48
02	61	Dongbu Urban Expressway Dongbuganseon-doro	동부간선도로 (동부간선)	32.5	overlap with National Route 46 and ce 30
03	-	Northern Highway Bukbuganseon-doro	북부간선도로 (북부간선)	7.8
04	70	Gangbyeon Northern Highway Gangbyeonbuk-ro	강변북로	29.0	overlap with National Route 46, National Route 77, ce 30 and ce 61
05	88	Olympic-daero Olympic-daero	올림픽대로	42.5
06	1	Gyeongbu Expressway Gyeongbuganseon-doro	경부간선도로 (경부간선)	6.8
07	94	Gangnam Loop Gangnamsunhwan-ro	강남순환로	13.8