The Ken-O Expressway (圏央道 Ken-Ō Dō ), or Metropolitan Inter-City Expressway (首都圏中央連絡自動車道 Shuto-ken Chūō Renraku Jidōsha-dō ), is a partially completed ticket system toll expressway in Japan, owned and operated by the Central Nippon Expressway Company and East Nippon Expressway Company. In conjunction with the Tokyo Bay Aqua-Line and the Bayshore Route of the Shuto Expressway, it will form a full outer ring road of Tokyo. It is assigned the national highway Route 468 number.
The section owned by the Central Nippon Expressway Company runs from the east end of the Shin-Shōnan Bypass west along the bypass and north to interchange 42. The rest is owned by the East Nippon Expressway Company.
The expressway will begin at the south end of the Bayshore Route in Yokohama, where it will head west on the existing branch of the Yokohama-Yokosuka Expressway to that road's main line. At the junction with the main line, the current expressway ends; ramp stubs are present to continue the road west. It will split from the planned Yokohama Ring Expressway and continue west to the east end of the Fujisawa Bypass (part of Route 1). An upgrade of that road will take it to the existing Shin-Shōnan Bypass, an expressway, which it will split from as that road turns towards the south.
The Ken-O Expressway will then head north, crossing the Tōmei Expressway and Chūō Expressway. North of the latter road, the present expressway begins, heading north and northeast to the junction with the Kan-Etsu Expressway. There it will continue east across the Tōhoku Expressway and Jōban Expressway; a short piece from the Joban Expressway east to the next interchange has been opened. It will turn southeast, crossing the Higashi-Kantō Expressway east of Narita Airport, and then running south to the present end of the Chiba-Tōgane Road, a two-lane expressway. Where that road abruptly turns west, the Ken-O Expressway will continue south, looping west to and at the junction of the Tokyo Bay Aqua-Line and Tateyama Expressway.
Along with the Japan National Route 16, Ken-Ō Expressway connects the entire length of the Technology Advanced Metropolitan Area (TAMA) Network region - an inland industrial area covering an area of 3000 km2, covering 74 municipalities and home to over 10 million people of whom 4 million work in the TAMA Network firms. In 1998 goods shipped from TAMA had twice the shipment value of the Silicon Valley.
Sections not yet opened are shown with a red background.
|Namiki (並木)||Shuto Expressway Bayshore Route; Route 357||counterclockwise exit and clockwise entrance|
|Horiguchi Noukendai (堀口能見台)||Route 16||counterclockwise exit and clockwise entrance|
|Kamariya Junction (釜利谷)||Yokohama-Yokosuka Expressway; Route 16 bypass|
|Sakae? Junction (栄)||Yokohama Ring Expressway|
|Fujisawa (藤沢)||Route 1||March 30, 1988|
|Chigasaki? (茅ヶ崎中央)||March 30, 1988|
|Nishikubo Junction (西久保)||Shin-Shōnan Bypass; Route 1 bypass|
|Samukawa South (寒川南)|
|Samukawa North (寒川北)|
|Ebina South Junction (海老名南)||Second Tōmei Expressway|
|Ebina North Junction (海老名北)||Tomei Expressway|
|Ebina North (海老名北)|
|Atsugi (圏央厚木)||Route 129/Route 246|
|Sagamihara (相模原)||Route 129|
|Takaosan (高尾山)||Route 20 bypass||March 25, 2012|
|40||Hachiōji Junction (八王子)||Chūō Expressway|
|41||Hachiōji West (八王子西)|
|42||Akiruno (あきる野)||Route 411||March 21, 2005|
|43||Hinode (日の出)||March 29, 2002|
|44||Ōme (青梅)||March 26, 1996|
|45||Iruma (入間)||Route 16||March 26, 1996|
|Sayama Parking Area (狭山PA)||July 18, 2008|
|46||Sayama Hidaka (狭山日高)||March 26, 1996|
|47||Tsurugashima (圏央鶴ヶ島)||March 26, 1996|
|50||Tsurugashima Junction (鶴ヶ島)||Kan-Etsu Expressway||March 26, 1996|
|Kawashima (川島)||Route 254|
|Okegawa Junction (桶川)||Route 17|
|Shōbu Shiraoka (菖蒲白岡)||Route 122 bypass|
|Kuki Shiraoka Junction (久喜白岡)||Tōhoku Expressway|
|Goka (五霞)||Route 4 bypass|
|Sakai (境)||Route 354 bypass|
|Sarusima Iwai (猿島岩井)|
|Mitsukaidō (水海道)||Route 294 bypass|
|80||Tsukuba Junction (つくば)||Jōban Expressway||March 29, 2003|
|81||Tsukuba Ushiku (つくば牛久)||Route 6 bypass||March 29, 2003|
|Ami East (阿見東)|
|Kanzaki (神崎)||Route 356 bypass|
|Taiei Junction (大栄)||Higashi-Kantō Expressway|
|Matsuo Yokoshiba (松尾横芝)||March 30, 1998|
|Sanbu Narutō (山武成東)||March 30, 1998|
|Tōgane Junction (東金)||Chiba-Tōgane Road; Route 126||March 30, 1998|
|Mobara North (茂原北)|
|Mobara Chōnan (茂原長南)||Route 409|
|Ichihara South (市原南)||Route 297|
|Kisarazu (木更津)||Route 410 bypass|
|Kisarazu Junction (木更津)||Tokyo Bay Aqua-Line; Tateyama Expressway|
|Wikimedia Commons has media related to: Ken-O Expressway|
- Chandra, Pankaj. "Networks of Small Producers for Technological Innovations: Some Models". IIM Ahmedabad Working Paper No. 2006-03-02, March 2006. IIM Ahmedabad. Retrieved 10 March 2012.