Special Metropolitan City roads of Seoul

The Seoul Metropolitan City roads, known as 서울특별시도 in Korean (Seoulteukbyeolsido), is a form network of highways that cover the metropolitan region of Seoul. These highways are maintained and designated by urban municipalities and are distinguished from other road systems by their official number and guide number. The official numbering system is specifically used in the legal context, while the guide numbering system is utilized for signage and is widely acknowledged by the public.

Classification

Seoul Metropolitan City roads consist of three categories: urban expressways (도시고속도로 in Korean), trunk routes (주간선도로 in Korean), and auxiliary routes (보조간선도로 in Korean).

Urban expressways

There are a total of 10 routes in the Seoul Metropolitan City road network, and some of these routes may overlap with each other.

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	Seobu Ganseondoro Seobuganseon-doro	서부간선도로 (서부간선)	16.8	overlap with National Route 1 and National Route 48
02	61	Dongbu Expressway Dongbuganseon-doro	동부간선도로 (동부간선)	32.5	overlap with National Route 46 and ce 30
03	-	Bukbu Expressway 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 Urban Expressway Gyeongbuganseon-doro	경부간선도로 (경부간선)	6.8	Original routing of Gyeongbu Expressway into Seoul
07	94	Gangnam Beltway Gangnamsunhwan-ro	강남순환로	13.8
08	-	Shinwol-Yeoui Underpass Sinwolyeoui-jihadololeul	신월여의지하도로를	7.7	Underground bypass of Gukhoe-daero
09	-	Western Arterial Underpass Seobuganseon-jihadolo	서부간선지하도로	9.0	Underground bypass of Seobu Ganseondoro

Other guided routes

Number	Link	Length (km)	Note
20	Seoul City Route 20	21.3
21	Seoul City Route 21	24.2
31	Seoul City Route 31	17
41	Seoul City Route 41	27.5
51	Seoul City Route 51	31
60	Seoul City Route 60	33.6
71	Seoul City Route 71	18.7
90	Seoul City Route 90	28.3
92	Seoul City Route 92	44.6

Trunk routes

Number	Name	Korean name	Length (km)	Note
C1	Downtown Ring Road	도심순환도로	11.44	Part of National Route 48
21	Siheung-Jungnim Line	시흥 ~ 중림선	17.69	Part of National Route 1
22	Sillim-Jingwan Inner Line	신림 ~ 진관내선	22.6	Part of National Route 1, overlaps Route C1
23	Galhyeon-Jeokseon Line		9.7
24	Bongrae-Sejongro Line		2.24
25	Sadang-Seobinggo Line		8.25
26	Umyeon-Junghag Line		14.34
27	Jangji-Gahoe Line		21.22
28	Pildong-Dobong Line		16.48
29	Yangjae-Hyehwa Line		12.94
30	Naegok-Wolgok Line		19.56
31	Jangji-Seongsu Line		11.73
32	Segok-Sanggye Line		29.08
41	Umyeon-Suseo Line		9.18
42	Banghwa-Sagajeong Line		51.76
43	Sinjeong-Bongcheon Line		9.8
44	Sadang-Amsa Line		17.07
45	Gwahae-Samsung Line		26.84
46	Yangpyeong-Nogosan Line		5.64
47	Gongdeok-Penglai Line		2.56
48	Eulji-Dunchon Line		16.24
49	Sinwol-Sindang Line		17.05
50	Seorin-Sangil Line		19.85
51	Onsu-Mangu Line		30.27
52	Sinseol-Gongneung Line		11.03
53	Gayang-Hyeonjeo Line		12.24

Auxiliary routes

Three-digit routes

Number	Name	Korean name	Via road	Length (km)	Note
101	Gwangmyeong-Siheung Line	광명 - 시흥선	Kia-ro	0.35
103	Siheung-Sillim Line	시흥 - 신림선	Geumha-ro, Hoam-ro	6.29
105	Siheung Line	시흥선	Hoam-ro	1.28
107	Garibong-Doksan Line	가리봉 - 독산선	Beoman-ro	1.72
111	Seongsan-Jingwan Line		Nongsusansijang-ro, World Cup-ro, Jeungsan-ro, Yeonseo-ro	12.56	Part of National Route 1
112	Sangam Line		World Cup Bridge, Jeungsan-ro	3.29
113	Seongsan-Hongje Line		Nongsusansijang-ro, World Cup-ro, Sandnae-ro	5.69
115	Sangam-Daeheung Line		World Cup-ro, Dokmak-ro, Daeheung-ro	8.73
117	Sangam-Seogyo Line		Worldcupbuk-ro, Hongik-ro	5.53
119	Sangam-Seongsan Line		Sungam-ro	3.65
121	Jeungsan-Yeonhui Line		Jeungga-ro	2.70
123	Sinsa-Hongeun Line		Gajwa-ro	4.21
125	Seooleung-Jingwanoe Line		Jingwan 1-ro	1.04
127	Jingwannae-Jingwanoe Line		Bukhansan-ro	2.19
301	Wolgog Line		Opaesan-ro	0.90
401	Cheong-Wonhyo Line		Wonhyo-ro	0.70
403	Seongsu Line		Wangsimni-ro	0.41
405	Noyu-Junggog Line		Neungdong-ro	4.51
407	Jamsil Railway Bridge		Jamsil Railway Bridge, Gangbyeon Station Road	2.04
501	Jamsil-Bangi Line		Baekje Gobun-ro	5.15

2000-3000 series

Number	Name	Korean name	Via road	Length (km)	Note
2101	Siheung-Doksan Main Line		Doksan-ro	3.70
2103	Doksan-Deungchon Main Line		Gasan-ro, Nambusunhwan-ro, Gurodong-ro, Gurojungang-ro, Mokdong-ro, Deungchon-ro	10.06	Duplicates City Route 42
2105	Doksan-Bongcheon Line		Munseong-ro, Sillim-ro, Ssukgogae-ro	4.38	Overlaps City Route 4223
2107	Garibong-Singil Line		Gamasan-ro	5.38
2109	Daelim-Yeongdeungpo Line		Singil-ro	2.95
2111	Yeouido Line		Yeouidong-ro, Yeouiseo-ro	7.20
2112	Yeouido Dunchi Line		Yeoui Interchange entrance and exit road	3.85
2113	Uisadang-daero		Uisadang-daero	1.63
2115	Bongrae-Gwanhun Line		Chilpae-ro, Sejong-daero, Namdaemun-ro, Ujeongguk-ro	2.61	Duplicates City Routes 24 and C1
2201	Sangdo-Sadang Line		Sadang-ro	2.35
2203	Yongsan-Seobingo Line		Seobinggo-ro	2.68	Duplicates City Route 25
2205	Galwol-Dongja Line		Duteopbawi-ro, Hoam-ro	1.78
2207	Hannam-Taepyeong Line		Sowol-ro	3.78
2209	Namchang-Namsan Line		Sopa-ro	1.41
2301	Yeokchon-Nokbeon Line		Seooreung-ro, Eunpyeong-ro	1.32
2303	Palpan-Hyoja Line		Cheongwa-daero, Hyoja-ro	1.00
2305	Yeokchon-Daejo Line		Jinheung-ro	1.90	Duplicates City Route 23
2501	Yongsan-Seongsu Line		Seobinggo-ro, Ttukseom-ro	1.00	Former portion of Gangbyeon North Road
2503	Kumho-Cheong Line		Kumho-ro, Cheonggu-ro	2.27
2601	Seocho-Cheongdam Line		Saimdang-ro, Yeoksam-ro	6.29
2603	Namsan Tunnel 2 Line		Noksapyeong-daero 58-gil	1.93
2701	Sinsa-Cheongdam Line		Dosan-daero	3.00
2702	Wirye Tunnel Line		Wirye Tunnel	2.27
2703	Hannam-Eungbong Line		Dogseodang-ro	4.95
2705	Chungmu-Nakwon Line		Supyo-ro	1.23
2707	Pildong-Waryong Line		Chungmu-ro, Donhwamun-ro	1.87
2709	Jeodong-Eulji Line		Mareunnae-ro	1.73
2801	Dongseon-Jeongleung Line		Alilang-ro	1.51
2803	Donam-Changdong Line		Samyang-ro, Haedeung-ro	9.83
2805	Mia-Sanggye Line		Wolgye-ro, Hangeulbiseok-ro	9.79
2807	Jeongneung-Beondong Line		Bogukmun-ro, Solsaem-ro, Ohyeon-ro	6.51
2809	Mia-Suyu Line		Insubong-ro	3.15
2811	Suyu-Sanggye Line		Deokneung-ro	9.82
2813	Suyu-Sanggye 7 Line		Nohae-ro	5.19
2815	Ssangmun-Dobong Line		Sirubong-ro	3.10
2817	Gongneung-Uiseon Line		Nowon-ro, Banghak-ro	10.87
2819	Dobong Station Line		Dobong-ro 170-gil, Dongil-ro 243-gil	0.99	Overlaps National Route 3
2821	Dobongsan Entrance Line		Dobongsan Trail	0.53
2901	Hannam-Gwanghui Line		Jangchungdan-ro	2.15