# Ken-Ō Expressway

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. It is 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, the expressway will form a full outer ring road of Tokyo. It is signed as National Route 468 as well as C4 under the "2016 Proposal for Realization of Expressway Numbering."
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 Akiruno Interchange. The rest of the route is owned by the East Nippon Expressway Company.

## Route description

The expressway begins at the west end of the Fujisawa Bypass (part of Route 1) in Fujisawa, Kanagawa. From here the expressway is concurrent with the Shin-Shōnan Bypass, which it splits from as that road turns toward the south at Chigasaki.
The Ken-O Expressway then heads north, crossing the Tōmei Expressway and Chūō Expressway. Continuing north, then east. There are junctions with the Kan-Etsu Expressway, Tōhoku Expressway, and Jōban Expressway. It then turns southeast, where it meets the Higashi-Kantō Expressway east of Narita Airport, there is gap in the expressway here that is planned to be closed. The expressway resumes at Choshu Renraku Road in Tōgane. It crosses the present east end of the Chiba-Tōgane Road, a two-lane expressway. The Ken-O Expressway continues south, looping west to end at the junction of the Tokyo Bay Aqua-Line and Tateyama Expressway.

## History

The Ken-Ō Expressway was linked with the Shin-Tōmei Expressway on 28 January 2018.
The smart interchange in Ōamishirasato was opened on 24 March 2019.

## Future

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 expressway. In Chiba Prefecture, land acquisition is under way for an 18 kilometres (11 mi) gap in the expressway to be filled. The new segment is expected to reach completion by 2024.

## Economic significance

Along with Japan National Route 16, the Ken-Ō Expressway will connect the entire length of the Technology Advanced Metropolitan Area (TAMA) — an inland industrial region covering an area of 3000 km$^2$, in 74 municipalities, and home to over 10 million people of whom 4 million work in the TAMA firms. In 1998 goods shipped from TAMA had twice the shipment value of the Silicon Valley.

## Junction list

Parking areas are appended with PA and smart interchanges are appended with SIC. There are currently no service areas.
| Prefecture | Location | km | mi | Exit | Name | Destinations | Notes |
| Through to National Route 1 (Fujisawa Bypass) ||||||||
| Kanagawa | Fujisawa | | | - | Fujisawa | National Route 129 | East end of concurrency with Shin-Shōnan Bypass. Western terminus of the expressway as of January 2018. |
| Kanagawa | Chigasaki | 0 | 0.0 | 24 | Chigasaki-chūō | Kanagawa Prefecture Routes 44/45 | |
| Kanagawa | Chigasaki | 0 | 0.0 | 25 | Chigasaki | Shin-Shōnan Bypass west – Yokohama, Odawara | West end of concurrency with Shin-Shōnan Bypass; |
| Kanagawa | Samukawa | 1.9 | 1.2 | 26 | Samukawa-minami | Kanagawa Prefecture Route 44 | The Ken-Ō Expressway turns from west to north, or south to east |
| Kanagawa | Samukawa | 5.1 | 3.2 | 27 | Samukawa-kita | Kanagawa Prefecture Route 46 | |
| Kanagawa | Ebina | 7.9 | 4.9 | 1 | Ebina-minami | Shin-Tōmei Expressway west – Atsugi-Minami | |
| Kanagawa | Ebina | 9.4 | 5.8 | 4-1 | Ebina | Tōmei Expressway – Nagoya, Tokyo | |
| Kanagawa | Ebina | 11.3 | 7.0 | 31 | Ebina | Kanagawa Prefecture Route 43 | |
| Kanagawa | Atsugi | 16.2 | 10.1 | 32 | Ken-Ō-Atsugi | National Route 129 | |
| Kanagawa | Atsugi | 17.5 | 10.9 | PA | Atsugi Parking Area | | |
| Kanagawa | Sagamihara | 21.4 | 13.3 | 33 | Sagamihara-Aikawa | National Route 129/ Kanagawa Prefecture Route 52 | |
| Kanagawa | Sagamihara | 30.3 | 18.8 | 34 | Sagamihara | Kanagawa Prefecture Route 510 | |
| Tokyo | Hachiōji | 36.2 | 22.5 | 35 | Takaosan | National Route 20 | |
| Tokyo | Hachiōji | 38.2 | 23.7 | 6 | Hachiōji | Chūō Expressway – Kōfu, Shinjuku | |
| Tokyo | Hachiōji | 42.6 | 26.5 | 41 | Hachiōji-nishi | Tokyo Metropolitan Route 61 | |
| Tokyo | Akiruno | 47.8 | 29.7 | 42 | Akiruno | National Route 411/ Tokyo Metropolitan Route 169 | |
| Tokyo | Hinode | 49.8 | 30.9 | 43 | Hinode | Tokyo Metropolitan Route 184 | |
| Tokyo | Ōme | 58.5 | 36.4 | 44 | Ōme | Tokyo Metropolitan Route 44 | |
| Saitama | Iruma | 63.3 | 39.3 | 45 | Iruma | National Route 16 | |
| Saitama | Sayama | 67.4 | 41.9 | PA | Sayama Parking Area | | |
| Saitama | Sayama | 69.3 | 43.1 | 46 | Sayama Hidaka | Saitama Prefecture Route 397 | |
| Saitama | Tsurugashima | 76.1 | 47.3 | 47 | Ken-Ō-Tsurugashima | National Route 407 | |
| Saitama | Tsurugashima | 78.3 | 48.7 | 50 | Tsurugashima | Kan-etsu Expressway – Niigata, Nerima | |
| Saitama | Sakado | 83.5 | 51.9 | 51 | Sakado | Saitama Prefecture Route 269 | |
| Saitama | Kawajima | 86 | 53 | 52 | Kawajima | National Route 254 | |
| Saitama | Okegawa | 91.7 | 57.0 | 60 | Okegawa-Kitamoto | National Route 17 | |
| Saitama | Okegawa | 96.4 | 59.9 | 61 | Okegawa-Kano | National Route 17/ Saitama Prefecture Route 12 | |
| Saitama | Kuki | 99.2 | 61.6 | PA | Shobu PA | | |
| Saitama | Shiraoka | 102.5 | 63.7 | 62 | Shiraoka-Shobu | National Route 122 | |
| Saitama | Kuki | 105.8 | 65.7 | 70 | Kuki-Shiraoka | Tōhoku Expressway – Utsunomiya, Tokyo | |
| Saitama | Satte | 114.3 | 71.0 | 71 | Satte | Saitama Prefecture Route 383 | |
| Ibaraki | Goka | 118.5 | 73.6 | 72 | Goka | National Route 4 | |
| Ibaraki | Sakai | 125.4 | 77.9 | 73 | Sakai-Koga | National Route 354 | The Ken-Ō Expressway turns from travelling north to south and south to north |
| Ibaraki | Bandō | 134.5 | 83.6 | 74 | Bandō | Ibaraki Prefecture Route 20 | |
| Ibaraki | Bandō | | | PA | Bandō Parking Area | | |
| Ibaraki | Jōsō | 143.4 | 89.1 | 75 | Jōsō | National Route 294 | |
| Ibaraki | Tsukuba | 150 | 93 | - | Tsukuba SIC | Ibaraki Prefecture Route 45 | Completion is set for 2021. |
| Ibaraki | Tsukuba | 153.9 | 95.6 | 76 | Tsukuba-chūō | Ibaraki Prefecture Route 19 | |
| Ibaraki | Tsukuba | 158.2 | 98.3 | 80 | Tsukuba | Jōban Expressway – Iwaki, Tokyo | |
| Ibaraki | Tsukuba | 159.7 | 99.2 | 81 | Tsukuba-Ushiku | National Route 6 | |
| Ibaraki | Ami | 165.8 | 103.0 | 82 | Ushiku-Ami | Ibaraki Prefecture Route 48 | |
| Ibaraki | Ami | 171.7 | 106.7 | 83 | Ami-higashi | Ibaraki Prefecture Route 34 | |
| Ibaraki | Inashiki | 175.7 | 109.2 | PA | Edosaki Parking Area | | |
| Ibaraki | Inashiki | 177.7 | 110.4 | 84 | Inashiki | Ibaraki Prefecture Route 49 | |
| Ibaraki | Inashiki | 183.7 | 114.1 | 85 | Inashiki-higashi | Ibaraki Prefecture Route 103 | |
| Chiba | Kōzaki | 188.3 | 117.0 | 86 | Kōzaki | National Route 356 | |
| Chiba | Narita | 192.1 | 119.4 | 87 | Shimofusa | Chiba Prefecture Route 63 | |
| Chiba | Narita | 198 | 123 | 90 | Taiei | Higashi-Kantō Expressway – Narita International Airport, Kashima, Tokyo | |
| 18 km gap in the expressway. ||||||||
| Chiba | Sanmu | 216.1 | 134.3 | 93 | Matsuo-Yokoshiba | Choshu Renraku Road / Chiba Prefecture Route 62 | |
| Chiba | Sanmu | 223.5 | 138.9 | 94 | Sanbu-Narutō | Chiba Prefecture Route 62 | |
| Chiba | Tōgane | 232.2 | 144.3 | 100 | Tōgane | Chiba-Tōgane Road west – Chiba | |
| Chiba | Tōgane | 232.2 | 144.3 | 101 | Tōgane | National Route 126 | |
| Chiba | Ōamishirasato | 239.7 | 148.9 | 101-1 | Ōamishirasato SIC | | |
| Chiba | Mobara | 243.1 | 151.1 | 102 | Mobara-kita | Chiba Prefecture Route 21/ Chiba Sotobō Toll Road | |
| Chiba | Mobara | 248.6 | 154.5 | - | Mobara-Nagara SIC | | Opened in 2020 |
| Chiba | Chōnan | 253.8 | 157.7 | 103 | Mobara-Chōnan | National Route 409 | |
| Chiba | Ichihara | 262.6 | 163.2 | 104 | Ichihara-Tsurumai | National Route 297 | |
| Chiba | Ichihara | 264.4 | 164.3 | PA | Takatakiko Parking Are | | |
| Chiba | Kisarazu | 275.1 | 170.9 | 105 | Kisarazu-higashi | National Route 410 / Chiba Prefecture Route 24 – Chiba, Ichihara, Kamogawa, Kururi | |
| Chiba | Sodegaura | | | - | Kazusa | Chiba Prefecture Route 33 | |
| Chiba | Kisarazu | 282.1 | 175.3 | 110 | Kisarazu | Tateyama Expressway – Tateyama, Chiba | |
| Through to Tokyo Bay Aqua-Line ||||||||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Electronic toll collection Incomplete access Unopened ||||||||