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.

Officialnumber Guidednumber Name Korean name Length(km) Note C3 - Seoul Inner LoopNaebusunhwan-ro 내부순환로 (내부순환도시고속도로) 40.1 01 Seobu GanseondoroSeobuganseon-doro 서부간선도로(서부간선) 16.8 Portion of 02 Dongbu ExpresswayDongbuganseon-doro 동부간선도로(동부간선) 32.5 overlap with , Local Route 23 and Seoul City Expressway C3 03 - Bukbu ExpresswayBukbuganseon-doro 북부간선도로(북부간선) 7.8 04 Gangbyeon Northern HighwayGangbyeonbuk-ro 강변북로 29.0 overlap with , and Local Route 23; also signed as Seoul City Expressway C3 05 Olympic-daeroOlympic-daero 올림픽대로 42.5 Gyeongbu Urban ExpresswayGyeongbuganseon-doro 경부간선도로(경부간선) 6.8 Original routing of Gyeongbu Expressway into Seoul 07 Gangnam BeltwayGangnamsunhwan-ro 강남순환로 13.8 08 - Shinwol-Yeoui UnderpassSinwolyeoui-jihadololeul 신월여의지하도로를 7.7 Underground bypass of Gukhoe-daero 09 - Western Arterial UnderpassSeobuganseon-jihadolo 서부간선지하도로 9.0 Underground bypass of Seobu Ganseondoro

Other guided routes Number Link Length(km) Note Seoul City Route 20 21.3 Seoul City Route 21 24.2 Seoul City Route 30 22 Seoul City Route 31 17 Seoul City Route 41 27.5 Seoul City Route 50 30.4 Seoul City Route 51 31 Seoul City Route 60 33.6 Seoul City Route 71 18.7 Seoul City Route 90 28.3 Seoul City Route 92 44.6

Trunk routes Number Name Korean name Length(km) Note Downtown Ring Road 도심순환도로 11.44 Part of Siheung-Jungnim Line 시흥 ~ 중림선 17.69 Part of Sillim-Jingwan Inner Line 신림 ~ 진관내선 22.6 Part of , overlaps Route C1 Galhyeon-Jeokseon Line 9.7 Bongrae-Sejongro Line 2.24 Sadang-Seobinggo Line 8.25 Umyeon-Junghag Line 14.34 Jangji-Gahoe Line 21.22 Pildong-Dobong Line 16.48 Yangjae-Hyehwa Line 12.94 Naegok-Wolgok Line 19.56 Jangji-Seongsu Line 11.73 Segok-Sanggye Line 29.08 Umyeon-Suseo Line 9.18 Banghwa-Sagajeong Line 51.76 Sinjeong-Bongcheon Line 9.8 Sadang-Amsa Line 17.07 Gwahae-Samsung Line 26.84 Unsigned; overlaps National Route 6, National Route 47, National Route 77 and Seoul City Route 23 Yangpyeong-Nogosan Line 5.64 Gongdeok-Penglai Line 2.56 Eulji-Dunchon Line 16.24 Sinwol-Sindang Line 17.05 Overlaps National Route 6 Seorin-Sangil Line 19.85 Onsu-Mangu Line 30.27 Unsigned; overlaps National Route 6 and National Route 47 Sinseol-Gongneung Line 11.03 Gayang-Hyeonjeo Line 12.24

Auxiliary routes

Three-digit routes Number Name Korean name Via road Length(km) Note Gwangmyeong-Siheung Line 광명 - 시흥선 Kia-ro 0.35 Siheung-Sillim Line 시흥 - 신림선 Geumha-ro, Hoam-ro 6.29 Siheung Line 시흥선 Hoam-ro 1.28 Garibong-Doksan Line 가리봉 - 독산선 Beoman-ro 1.72 Seongsan-Jingwan Line Nongsusansijang-ro, World Cup-ro, Jeungsan-ro, Yeonseo-ro 12.56 Part of Sangam Line World Cup Bridge, Jeungsan-ro 3.29 Seongsan-Hongje Line Nongsusansijang-ro, World Cup-ro, Sandnae-ro 5.69 Sangam-Daeheung Line World Cup-ro, Dokmak-ro, Daeheung-ro 8.73 Sangam-Seogyo Line Worldcupbuk-ro, Hongik-ro 5.53 Sangam-Seongsan Line Sungam-ro 3.65 Jeungsan-Yeonhui Line Jeungga-ro 2.70 Sinsa-Hongeun Line Gajwa-ro 4.21 Seooleung-Jingwanoe Line Jingwan 1-ro 1.04 Jingwannae-Jingwanoe Line Bukhansan-ro 2.19 Wolgog Line Opaesan-ro 0.90 Cheong-Wonhyo Line Wonhyo-ro 0.70 Seongsu Line Wangsimni-ro 0.41 Noyu-Junggog Line Neungdong-ro 4.51 Jamsil Railway Bridge Jamsil Railway Bridge, Gangbyeon Station Road 2.04 Jamsil-Bangi Line Baekje Gobun-ro 5.15

2000-3000 series Number Name Korean name Via road Length(km) Note Siheung-Doksan Main Line Doksan-ro 3.70 Doksan-Deungchon Main Line Gasan-ro, Nambusunhwan-ro, Gurodong-ro, Gurojungang-ro, Mokdong-ro, Deungchon-ro 10.06 Duplicates City Route 42 Doksan-Bongcheon Line Munseong-ro, Sillim-ro, Ssukgogae-ro 4.38 Overlaps City Route 4223 Garibong-Singil Line Gamasan-ro 5.38 Daelim-Yeongdeungpo Line Singil-ro 2.95 Yeouido Line Yeouidong-ro, Yeouiseo-ro 7.20 Yeouido Dunchi Line Yeoui Interchange entrance and exit road 3.85 Uisadang-daero Uisadang-daero 1.63 Bongrae-Gwanhun Line Chilpae-ro, Sejong-daero, Namdaemun-ro, Ujeongguk-ro 2.61 Duplicates City Routes 24 and C1 Sangdo-Sadang Line Sadang-ro 2.35 Yongsan-Seobingo Line Seobinggo-ro 2.68 Duplicates City Route 25 Galwol-Dongja Line Duteopbawi-ro, Hoam-ro 1.78 Hannam-Taepyeong Line Sowol-ro 3.78 Namchang-Namsan Line Sopa-ro 1.41 Yeokchon-Nokbeon Line Seooreung-ro, Eunpyeong-ro 1.32 Palpan-Hyoja Line Cheongwa-daero, Hyoja-ro 1.00 Yeokchon-Daejo Line Jinheung-ro 1.90 Duplicates City Route 23 Yongsan-Seongsu Line Seobinggo-ro, Ttukseom-ro 1.00 Former portion of Gangbyeon North Road Kumho-Cheong Line Kumho-ro, Cheonggu-ro 2.27 Seocho-Cheongdam Line Saimdang-ro, Yeoksam-ro 6.29 Namsan Tunnel 2 Line Noksapyeong-daero 58-gil 1.93 Sinsa-Cheongdam Line Dosan-daero 3.00 Wirye Tunnel Line Wirye Tunnel 2.27 Hannam-Eungbong Line Dogseodang-ro 4.95 Chungmu-Nakwon Line Supyo-ro 1.23 Pildong-Waryong Line Chungmu-ro, Donhwamun-ro 1.87 Jeodong-Eulji Line Mareunnae-ro 1.73 Dongseon-Jeongleung Line Alilang-ro 1.51 Donam-Changdong Line Samyang-ro, Haedeung-ro 9.83 Mia-Sanggye Line Wolgye-ro, Hangeulbiseok-ro 9.79 Jeongneung-Beondong Line Bogukmun-ro, Solsaem-ro, Ohyeon-ro 6.51 Mia-Suyu Line Insubong-ro 3.15 Suyu-Sanggye Line Deokneung-ro 9.82 Suyu-Sanggye 7 Line Nohae-ro 5.19 Ssangmun-Dobong Line Sirubong-ro 3.10 Gongneung-Uiseon Line Nowon-ro, Banghak-ro 10.87 Dobong Station Line Dobong-ro 170-gil, Dongil-ro 243-gil 0.99 Overlaps Dobongsan Entrance Line Dobongsan Road 0.53 Hannam-Gwanghui Line Jangchungdan-ro 2.15 Seongsu-dong 1-ga Line Gwangnaru-ro 1.33 Heungin-Myeonmok Line Majang-ro, Sagajeong-ro 7.75 Majang-Sagun Line Salgoji-gil, Majolo 5.22 Jongam-Hoegi Line Hoe-ro 1.66 Geumho-Haengdang Line Haengdang-ro 1.33 Jangji-Geoyeo Line Wiryeseo-ro, Yangsan-ro 1.38 Jangji-Munjeong Line Wirye Jungang-ro, Tancheondong-ro 3.81 Munjeong-Godeok Line Chungmin-ro 2-gil, Saemal-ro 8-gil, Munjeong-ro 4-gil, Songi-ro 32-gil, Dongnam-ro 12-gil, Dongnam-ro 9.82 Sincheon-dong Line Olympic-ro 35-gil 1.51 Guui-Gwangjang Line Achasan-ro 3.88 Overlaps and Guui Line Jayang-ro 1.69 Overlaps Seongsu-Jayang Line Ttukseom-ro 5.50 Myeonmok-Sangbong Line Myeonmokcheon-ro, Mangwu-ro 52-gil 1.65 Hwigyeong-Myeonmok Line Gyeomjae-ro 2.64 Bongujae Line Bongujae-ro 2.40 Imun-Sinnae Line Hancheon-ro 58-gil, Bonghwasan-ro 4.06 Nowon Station-Buramsan Station Line Sanggye-ro 3.15 Jagok-Moonjeong Line Jagok-ro, Saemal-ro 1.74

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