Special Metropolitan City roads of Seoul

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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
cr 30
Seoul Inner Loop
Naebusunhwan-ro
내부순환로 (내부순환도시고속도로) 40.1 overlap with National Route 46 and National Route 77
01
1
nr 1
Seobu Ganseondoro
Seobuganseon-doro
서부간선도로
(서부간선)
16.8 overlap with National Route 1 and National Route 48
02
61
cr 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
cr 70
Gangbyeon Northern Highway
Gangbyeonbuk-ro
강변북로 29.0 overlap with National Route 46, National Route 77, ce 30 and ce 61
05
88
cr 88
Olympic-daero
Olympic-daero
올림픽대로 42.5
06
cr 06
1
ex 1
Gyeongbu Urban Expressway
Gyeongbuganseon-doro
경부간선도로
(경부간선)
6.8 Original routing of Gyeongbu Expressway into Seoul
07
94
cr 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
cr 20
Seoul City Route 20 21.3
21
cr 21
Seoul City Route 21 24.2
31
cr 31
Seoul City Route 31 17
41
cr 41
Seoul City Route 41 27.5
51
cr 51
Seoul City Route 51 31
60
cr 60
Seoul City Route 60 33.6
71
cr 71
Seoul City Route 71 18.7
90
cr 90
Seoul City Route 90 28.3
92
cr 92
Seoul City Route 92 44.6

Trunk routes

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

Auxiliary routes

Three-digit routes

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

2000-3000 series

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