Central Circular Route
{{short description|Circular expressway in the Greater Tokyo area}}
{{Use dmy dates|date=November 2019}}
{{infobox road|country=JPN
| name =Central Circular Route
| marker_image = 80px
| map ={{Highway system OSM map
| highway_system_qid = Q1369525
| frame-lat =
| frame-long =
| frame-width = 300
| frame-height = 300
| zoom = 10
| length =
| plain = yes
}}
|map_custom = yes
|maint= Metropolitan Expressway Company Limited
| length_mi =
| length_km = 46.9
| length_round =
| length_ref =
| established = 1982
| allocation =
| restrictions = No vehicles with dangerous goods allowed in the Yamate Tunnel
| direction_a = Counterclockwise
| terminus_a =File:Shuto Urban Expwy Sign B.svg Bayshore Route at Ōi Junction in Yashio, Shinagawa
| beltway_city=Tokyo
| junction = {{Plainlist|
- File:Shuto Urban Expwy Sign 0003.svg Shibuya Route at Ōhashi Junction in Meguro
- File:Shuto Urban Expwy Sign 0004.svg Shinjuku Route in Shinjuku
- File:Shuto Urban Expwy Sign 0005.svg Ikebukuro Route in Itabashi
- File:Shuto Urban Expwy Sign S1.svg Kawaguchi Route in Adachi
- File:Shuto Urban Expwy Sign 6-Misato.svg Misato Route and File:Shuto Urban Expwy Sign 6-Mukojima.svg Mukojima Route in Katsushika
- File:Shuto Urban Expwy Sign 0007.svg Komatsugawa Route in Edogawa
}}
| direction_b = Clockwise
| terminus_b = File:Shuto Urban Expwy Sign B.svg Bayshore Route at Kasai Junction in Edogawa
}}
File:Shuto expressway kasai jct.jpg
File:Shuto expressway ogiohashi.jpg
File:Shuto expressway senjushinbashi.jpg
File:Shuto expressway kohoku jct.jpg
The {{Nihongo|Central Circular Route|中央環状線|Chūō Kanjō-sen}}, signed as Route C2, is one of the routes of the Shuto Expressway system serving the central part of the Greater Tokyo Area. The route is a circumferential highway running through the outer wards of Tokyo. The route is the middle of four ring expressways planned for the city; the other three being the C1 Inner Circular Route, the C3 Tokyo Gaikan Expressway, and the C4 Ken-Ō Expressway.
Route description
The Central Circular Route has a total length of {{convert|48.8|km|mi|sp=us}}.
It is a ring that lies approximately {{convert|8|km|mi|abbr=on}} from the center of the city and goes through the wards of Edogawa, Katsushika, Adachi, Kita, Itabashi, Toshima, Shinjuku, Nakano, Shibuya, Meguro, and Shinagawa.
The eastern half is an elevated structure and the western half is an underground one. The Yamate Tunnel is a deep tunnel constructed beneath Yamate Street, the first section over {{convert|11|km|mi|abbr=on}} in length, was opened to traffic on 22 December 2007. From 2010, the tunnel extended the Central Circular Route south from near Ikebukuro to Ohashi Junction connecting with Route 3. The last {{convert|9.4|km|mi|sp=us}} through Meguro and Shinagawa was opened to traffic on 7 March 2015.{{cite web|title=Completion Date of Central Circular Route|url=http://www.shutoko.co.jp/company/press/h25/data/04/16_shinagawasen/|work=Press Release | date=16 April 2013 |publisher=Metropolitan Expressway Co. Ltd.|accessdate=7 April 2014}} When this last section of the tunnel opened the Yamate Tunnel formed Japan's longest, and the world's second longest road tunnel.{{cite web|title=Planning and Construction - Urban Long Tunnels, Yamate Tunnel|url=http://www.shutoko.co.jp/english/technology/planningconstruction/|website=Shutoko|publisher=Metropolitan Expressway Company Limited|accessdate=6 March 2015}} During the tunnel's first week of operations, traffic volume on the Inner Circular Route was reduced by seven percent from the previous week, and congestion on expressways inside the Central Circular Route (an index measured by recording segments where average traffic speed is less than {{convert|40|km/h||abbr=on|1}}, and multiplying the affected distance by the affected time) was approximately halved from the previous week.{{cite web|last1=下田|first1=健太郎|title=中央環状線内側の首都高各線で渋滞・混雑量が半減|url=http://www.nikkei.com/article/DGXMZO84540010Y5A310C1000000/?n_cid=kobetsu|website=Nihon Keizai Shimbun|publisher=日経コンストラクション|accessdate=20 March 2015|date=19 March 2015}}
The C2 begins and ends at the Bayshore Route, which serves to close the southeastern part of the loop.
History
The first section of the Central Circular Route was opened to traffic on 30 March 1982. Since then, the expressway was completed in phases. Construction work on underground sections of the route began in 1992. Given the extensive tunneling and engineering challenges involved, construction costs for the route were estimated to be 2 trillion yen.{{cite news|title=Tokyo's 47-km-long expressway loop fully opens|url=http://www.japantimes.co.jp/news/2015/03/07/national/tokyos-47-km-long-expressway-loop-fully-opens/#.VPtrE2IaySM|accessdate=7 March 2015|agency=Jiji|publisher=The Japan Times|date=7 March 2015}} The Central Circular Route was completed on 7 March 2015.{{cite web|title=首都高の歴史|url=https://www.shutoko.jp/fun/history/|language=ja|work=Metropolitan Expressway|accessdate=8 November 2019}}
Exit list
{{JPNinttop|exit|name|nopref=yes}}
{{JPNint|exit|name
|location_special=Shinagawa
|lspan=4
|km=0.0
|exit=—
|type=
|name=Ōi
|road=File:Shuto Urban Expwy Sign B.svg Bayshore Route – Urayasu, Shin-Kiba, Haneda Airport
|notes=Counterclockwise terminus
}}
{{jcttunnel|exit|name
|km=0.6
|tunnel=South end of Yamate Tunnel
}}
{{JPNint|exit|name
|km=1.2
|exit=C18
|type=incomplete
|name=Ōi Minami
|road={{jct|country=JPN|Route|357}} (Tokyo Bay Road)
|notes=Northbound exit and southbound entrance; smart interchange
}}
{{JPNint|exit|name
|km=6.0
|exit=C20
|type=incomplete
|name=Gotanda
|road=Tokyo Metropolitan Route 317 (Yamate-dori)
|notes=Northbound exit and southbound entrance
}}
{{JPNint|exit|name
|location_special=Meguro
|lspan=1
|km=9.4
|exit=–
|type=
|name=Ōhashi
|road=File:Shuto Urban Expwy Sign 0003.svg File:JP Expressway E1.svg Shibuya Route west to Tōmei Expressway – Yoga
File:Shuto Urban Expwy Sign 0003.svg Shibuya Route east – Tanimachi
|notes=
}}
{{JPNint|exit|name
|location_special=Shibuya
|lspan=2
|km=11.4
|exit=C22
|type=incomplete
|name=Tomigaya
|road=Tokyo Metropolitan Route 317 (Yamate-dori)
|notes=Southbound exit and northbound entrance; smart interchange
}}
{{JPNint|exit|name
|km=11.8
|exit=C23
|type=incomplete
|name=Hatsudai-minami
|road=Tokyo Metropolitan Route 317 (Yamate-dori)
|notes=Northbound exit and southbound entrance; smart interchange
}}
{{JPNint|exit|name
|location_special=Shinjuku
|lspan=1
|km=13.0
|exit=–
|type=
|name=Nishi-Shinjuku
|road=File:Shuto Urban Expwy Sign 0004.svg File:JP Expressway E20.svg Shinjuku Route west to Chuo Expressway – Takaido
File:Shuto Urban Expwy Sign 0004.svg Shinjuku Route east – Miyakezaka
|notes=
}}
{{JPNint|exit|name
|location_special=Nakano
|lspan=1
|km=14.7
|exit=C24
|type=incomplete
|name=Nakano-Chojabashi
|road={{jct|country=JPN|Route|20}} (Kōshū Kaidō)
|notes= Southbound exit and northbound entrance; to Tokyo Metropolitan Government Building
}}
{{JPNint|exit|name
|location_special=Toshima
|lspan=4
|km=18.5
|exit=C25
|type=incomplete
|name=Nishi-Ikebukuro
|road=Mejiro-dori
Tokyo Metropolitan Route 441 (Kanamecho-dori)
|notes= Southbound exit and northbound entrance
}}
{{jcttunnel|exit|name
|km=18.8
|tunnel=North end of Yamate Tunnel
}}
{{JPNint|exit|name
|km=20.1
|exit=C26
|type=incomplete
|name=Nishi-Ikebukuro
|road=Mejiro-dori
Tokyo Metropolitan Route 441 (Kanamecho-dori)
|notes= Northbound exit and southbound entrance
}}
{{JPNint|exit|name
|km=20.1
|exit=C28
|type=closed
|name=Tomigaya
|road=Tokyo Metropolitan Route 317 (Yamate-dori)
|notes= Northbound entrance only via ECT; rest of exit closed in 2007
}}
{{JPNint|exit|name
|location_special=Itabashi
|lspan=3
|km=20.4
|exit=–
|type=incomplete
|name=Kumanocho
|road=File:Shuto Urban Expwy Sign 0005.svg Ikebukuro Route – Ginza, Higashi-Ikebukuro
|notes= No direct access from northbound Central Circular Route to southbound Ikebukuro Route
}}
{{JPNint|exit|name
|km=21.4
|exit=–
|type=
|name=Itabashi
|road=File:Shuto Urban Expwy Sign 0005.svg File:JP Expressway E17.svg Ikebukuro Route north to Kan-Etsu Expressway – Omiya
|notes=
}}
{{jcttunnel|exit|name
|km=21.5
|tunnel=Cardinal direction change: West Leg (north-south) / North Leg (west-east)
}}
{{JPNint|exit|name
|location_special=Itabashi – Kita boundary
|lspan=1
|km=22.3
|km2=22.4
|exit=C29
C31
|type=incomplete
|name=Shin-Itabashi
|road={{jct|country=JPN|Route|17}} (Nakasendo)
|notes=Eastbound exit only
Westbound exit and eastbound entrance; smart interchange
}}
{{JPNint|exit|name
|location_special=Kita
|lspan=2
|km=25.4
|exit=C33
|type=incomplete
|name=Oji-Minami
|road={{jct|country=JPN|Route|122}}
|notes=Eastbound exit and westbound entrance
}}
{{JPNint|exit|name
|km=26.1
|exit=C34
|type=Incomplete
|name=Oji-Kita
|road=Tokyo Metropolitan Route 306 (Oji-Senju Yumenoshima-sen)
|notes=Westbound exit and eastbound entrance
}}
{{JPNint|exit|name
|location_special=Adachi
|lspan=3
|km=27.9
|exit=–
|type=
|name=Kohoku
|road=File:Shuto Urban Expwy Sign S1.svg File:JP Expressway E4.svg Kawaguchi Route north to Tohoku Expressway – Kawaguchi
|notes=
}}
{{JPNint|exit|name
|km=28.4
|km2=29.4
|line=yes
|exit=C35
C36
|type=incomplete
|name=Ogi-ohashi
|road=Tokyo Metropolitan Route 58 (Ogubashi-dori)
|notes=Eastbound exit and westbound entrance
Westbound exit and eastbound entrance
}}
{{JPNint|exit|name
|km=31.4
|km2=32.4
|line=yes
|exit=C37
C38
|type=incomplete
|name=Senju-shinbashi
|road={{jct|country=JPN|Route|4}}
|notes=Eastbound exit and westbound entrance
Westbound exit and eastbound entrance
}}
{{jcttunnel|exit|name
|location_special=Katsushika
|lspan=6
|km=33.3
|tunnel=Cardinal direction change: North Leg (west-east) / East Leg (south-north)
}}
{{JPNint|exit|name
|km=33.6
|exit=–
|type=concur
|name=Kosuge
|road=File:Shuto Urban Expwy Sign 6-Misato.svg File:JP Expressway E6.svg Misato Route north to Joban Expressway – Misato
|notes=North end of concurrency with Shuto Expressway Route 6
}}
{{JPNint|exit|name
|km=34.1
|exit=C40
|type=incomplete
|name=Kosuge
|road=Tokyo Route 308 (Heiwabashi-dori)
|notes=Northbound exit and southbound entrance
}}
{{JPNint|exit|name
|km=34.8
|exit=–
|type=concur
|name=Horikiri
|road=File:Shuto Urban Expwy Sign 6-Mukojima.svg Mukojima Route south – Ginza, Hakozaki
|notes=South end of concurrency with Shuto Expressway Route 6
}}
{{JPNint|exit|name
|km=35.7
|km2=36.6
|exit=C41
C42
|type=etc
|name=Yotsugi
|road={{jct|country=JPN|Route|6}}
|notes=Southbound signage; smart interchange
Northbound signage; smart interchange
}}
{{JPNint|exit|name
|km=38.3
|exit=C43
|type=incomplete
|name=Hirai-ohashi
|road=Kuramaebashi-dori
|notes=Southbound exit and northbound entrance
}}
{{JPNint|exit|name
|location_special=Edogawa
|lspan=4
|km=40.5
|exit=C45
703
|type=incomplete
|name=Komatsugawa
|road=File:Shuto Urban Expwy Sign 0007.svg File:JP Expressway E14.svg Komatsugawa Route east to Keiyō Road – Chiba
Tokyo Metropolitan Route 308 (Funabori-kaidō) – Shinkoiwa, Funabori
|notes=No direct access to westbound Komatsugawa Route
}}
{{JPNint|exit|name
|km=42.2
|exit=C46
|type=incomplete
|name=Funaboribashi
|road=Tokyo Metropolitan Route 50 (Shin-Ohashi-dori)
|notes=Northbound exit and southbound entrance
}}
{{JPNint|exit|name
|km=44.4
|exit=C47
|type=incomplete
|name=Seishincho
|road=Tokyo Metropolitan Route 308 (Funabori-kaidō)
|notes=Southbound exit and northbound entrance; smart interchange
}}
{{JPNint|exit|name
|km=46.9
|exit=—
|type=
|name=Kasai
|road=File:Shuto Urban Expwy Sign B.svg Bayshore Route – Urayasu, Shin-Kiba, Haneda Airport
|notes=Clockwise terminus
}}
{{jctbtm|exit|keys=concur,closed,incomplete,etc,unbuilt}}