Tokyo Bay Aqua-Line
The Tokyo Bay Aqua-Line (東京湾アクアライン, Tōkyō-wan Akua-rain), also known as the Trans-Tokyo Bay Expressway, is an expressway that is mainly made up of a bridge–tunnel combination across Tokyo Bay in Japan. It connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba Prefecture, and forms part of National Route 409. With an overall length of 23.7 km, it includes a 4.4 km bridge and 9.6 km tunnel underneath the bay—the fourth-longest underwater tunnel in the world.
Tokyo Wan Aqua-Line Expressway | |
|---|---|
| 東京湾アクアライン | |
The Tokyo Bay Aqua-Line highlighted in red | |
| Route information | |
| Length | 23.7 km (14.7 mi) |
| Existed | 1997–present |
| Component highways | National Route 409 |
| Major junctions | |
| West end | Kawasaki Ukishima Junction Shuto Expressway Bayshore Route in Kawasaki, Kanagawa |
| Section 1 | |
| East end | Kisarazu Interchange Ken-Ō Expressway in Kisarazu, Chiba |
| Location | |
| Country | Japan |
| Highway system | |
Tokyo Bay Aqua-Line 東京湾アクアライン | |
|---|---|
Tokyo Bay Aqua-Line (bridge section) | |
| Coordinates | 35°27′47″N 139°52′31″E |
| Carries | 4 lanes of National Route 409 |
| Crosses | Tokyo Bay |
| Locale | |
| Other name(s) | Trans-Tokyo Bay Highway |
| Characteristics | |
| Design |
|
| Total length |
|
| Width | 22.9 metres (75 ft) |
| Longest span | 240 metres (787 ft) |
| Piers in water | 42 |
| Clearance below | 29 metres (95 ft) |
| History | |
| Fabrication by |
|
| Construction start | 1989 |
| Construction cost | ¥1.4 trillion |
| Opened | 18 December 1997 |
| Location | |
Umihotaru, where bridge transitions to tunnel | |
| Overview | |
|---|---|
| Status |
|
| Start | Umihotaru Island |
| End | Ukishima, Kawasaki, Kanagawa |
| Operation | |
| Constructed | Taisei |
| Technical | |
| No. of lanes | 2 (unidirectional) in each of 2 tunnels |
| Highest elevation | sea level |
| Lowest elevation | −45 metres (−148 ft) |
| Width |
|
| Grade | 4% |
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