Ken-Ō Expressway

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Ken-O Expwy Route Sign.svg

Japanese National Route Sign 0468.svg National Route 468
Route information
Length: 300 km (200 mi)
History: Opened in stages since 1996
Major junctions
Loop around Tokyo
West end: Kamariya Junction
East end: Kisarazu Junction
Major cities: Yokohama, Kanagawa (future)
Fujisawa, Kanagawa
Chigasaki, Kanagawa
Atsugi, Kanagawa
Sagamihara, Kanagawa (future)
Hachioji, Tokyo
Ome, Tokyo
Kawagoe, Saitama
Tsukuba, Ibaraki
Narita, Chiba (future)
Ichihara, Chiba
Kisarazu, Chiba
Highway system
National highways of Japan
Expressways of Japan
Ken-O at North Hachioji

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.

Portions of the existing Yokohama-Yokosuka Expressway, Shin-Shōnan Bypass and Chiba-Tōgane Road and the planned Yokohama Ring Expressway will be incorporated into the road.

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.

Route description[edit]

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.

Economic Significance[edit]

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.[1]

Exit list[edit]

Sections not yet opened are shown with a red background.

Number km Name Intersecting routes Opened Notes
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
Kuden (公田)
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
Shiroyama (城山)
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
Sakado (坂戸)
Kawashima (川島) Route 254
Okegawa Junction (桶川) Route 17
Okegawa (桶川)
Shōbu Shiraoka (菖蒲白岡) Route 122 bypass
Kuki Shiraoka Junction (久喜白岡) Tōhoku Expressway
Satte (幸手)
Goka (五霞) Route 4 bypass
Sakai (境) Route 354 bypass
Sashima Iwai (猿島岩井)
Mitsukaidō (水海道) Route 294 bypass
Tsukuba (つくば)
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 (阿見)
Ami East (阿見東)
Edosaki (江戸崎)
Inashiki East (稲敷東)
Kouzaki[disambiguation needed] (神崎) Route 356 bypass
Shimousa (下総)
Taiei Junction (大栄) Higashi-Kantō Expressway
Matsuo Yokoshiba (松尾横芝) March 30, 1998
Sanmu 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 2013
Ichihara tsurumai (市原鶴舞) Route 297 2013
Takatakiko PA (高滝湖)
Kisarazu East (木更津東) Route 410 bypass 2013
Kisarazu Junction (木更津) Tokyo Bay Aqua-Line; Tateyama Expressway 2013

External links[edit]


  1. ^ 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.