|Length||33.7 km (20.9 mi)|
|From||Tōmei Junction in Setagaya, Tokyo|
|To||Kōya Junction in Ichikawa, Chiba|
Shuto Expressway Bayshore Route
|Major cities||Wakō, Toda, Saitama, Kawaguchi, Sōka, Yashio, Misato|
|National highways of Japan|
Expressways of Japan
The name Gaikan refers to the route's status as an outer ring road (beltway) for Tokyo. The expressway is also referred to simply as Gaikan for short. It is the second of three expressway ring routes in the greater Tokyo area: the innermost is the Central Circular Route, then the Gaikan, and the outermost is the Ken-Ō Expressway. The Inner Circular Route of the Shuto Expressway is apparently not considered a true ring road, as the alternate Japanese name of the Ken-Ō Expressway (English name is Metropolitan Inter-City Expressway) is 三環状道路, with the first character meaning 'three' not 'four.' A section of the expressway on the northern side of the Tokyo area was the first to open to traffic (Ōizumi Junction to Misato-minami Interchange). Most of this section is an elevated roadway built on the median of National Route 298 with curved windbreaks on both sides. Most of the roadway has two lanes in each direction (three lanes from Ōizumi Junction to Wakō-kita Interchange).
The eastern section from Misato to Ichikawa was opened to the public on the 2nd June, 2018, three years after schedule. The western section from Izumi to the Chuo expressway is under construction, while the final section linking to the Tomei expressway is still at the planning stage. The western section will pass through the densely populated suburbs of western Tokyo; large parts of it will consist of tunnels constructed at least 40 m underground (deep underground).
List of interchanges and features
|16.2 km section under construction, planned connection to Tōmei Expressway|
|Tokyo||Nerima||0.0||0.0||50||Ōizumi||Tokyo Metropolitan Route 24 (Nerima Tokorozawa Route)||Current western terminus|
|Saitama||Wakō||3.4||2.1||51||Wakō||Saitama Prefecture Route 88 (Wakō Inter Route)|
|5.3||3.3||52||Wakō-kita||National Route 298||No through access between exit and PA|
|Wakō / Toda border||Sakitama Bridge|
|Toda||7.6||4.7||53||Toda-nishi||National Route 298||Misato-bound exit, Ōizumi-bound entrance only|
|8.5||5.3||60||Bijogi|| Ikebukuro Route|
|Controlled by traffic lights|
|9.9||6.2||61||Toda-higashi||National Route 298||Ōizumi-bound exit, Misato-bound entrance only|
|Kawaguchi||12.3||7.6||62||Gaikan Urawa||National Route 298||Ōizumi-bound exit, Misato-bound entrance only|
|14.0||8.7||63||Kawaguchi-nishi||National Route 298||Misato-bound exit, Ōizumi-bound entrance only|
|16.8||10.4||64||Kawaguchi-Chūō||National Route 298||Ōizumi-bound exit, Misato-bound entrance only|
|17.6||10.9||70||Kawaguchi|| Tōhoku Expressway north|
Kawaguchi Route south
|19.0||11.8||71||Kawaguchi-higashi||National Route 298||Ōizumi-bound exit, Misato-bound entrance only|
|Sōka||22.4||13.9||72||Sōka|| National Route 298|
National Route 4
|Yashio||73 / PA||Yashio||National Route 4||Planned|
|Misato||28.4||17.6||74||Gaikan Misato-nishi||National Route 298||Misato-bound exit, Ōizumi-bound entrance only|
|29.6||18.4||80||Misato|| Jōban Expressway|
|31.0||19.3||81 / TB||Misato-Chūō||National Route 298||Ōizumi-bound exit, Kōya-bound entrance only|
|33.7||20.9||82||Misato-minami||National Route 298||Kōya-bound exit, Ōizumi-bound entrance only|
|Chiba||Matsudo||39.1||24.3||83||Matsudo||National Route 298||Ōizumi-bound exit, Kōya-bound entrance only|
|Ichikawa||40.1||24.9||84||Kita-Chiba||National Route 464 (Kita-Chiba Road)||Planned|
|41.3||25.7||85||Ichikawa-kita|| National Route 298|
Chiba Prefecture Route 264 (Takatsuka Shinden Ichikawa Route)
|Kōya-bound exit, Ōizumi-bound entrance only|
|44.7||27.8||86||Ichikawa-Chūō||National Route 298||Ōizumi-bound exit, Kōya-bound entrance only|
|47.6||29.6||91||Ichikawa-minami||National Route 298||Kōya-bound exit, Ōizumi-bound entrance only|
|49.2||30.6||100||Kōya|| Higashi-Kantō Expressway|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- "E-NEXCO Expressway Data". Retrieved 2008-04-13.
- Ministry of Land, Infrastructure and Transport. "History of Tokyo's 3 Ring Roads". Archived from the original on 2008-04-02. Retrieved 2008-04-17.
- "E-NEXCO Opening Schedule". Retrieved 2008-04-15.
- "E-NEXCO Opening Schedule". Retrieved 2019-12-30.
- Ministry of Land, Infrastructure and Transport. "Tokyo Gaikan Website". Retrieved 2008-04-15.
- "E-NEXCO Drive Plaza Route Search". Retrieved 2008-04-15.
- (in Japanese) East Nippon Expressway Company
- (in Japanese) About the Gaikan (Chiba section)
- (in Japanese) Tokyo Ring Step (Tokyo section)