Tokyo Bay Aqua-Line

The Tokyo Bay Aqua-Line is a Japanese expressway linking Kawasaki and Kisarazu across Tokyo Bay. It combines a long underwater tunnel, a bridge, and the artificial island Umihotaru.

Tokyo Bay: A bay on Japan’s Pacific coast bordered by Tokyo, Kanagawa, Chiba, and Saitama prefectures. The expressway crosses this bay to connect its western and eastern shores.
Undersea tunnel: A passage constructed beneath a body of water for road, rail, or utility traffic. Most of the Aqua-Line’s western crossing runs through a tunnel beneath Tokyo Bay.
Tokyo Bay crossing project: A Japanese infrastructure project to connect the shores of Tokyo Bay by road. The Aqua-Line was built as the road crossing envisioned by this project.
Tokyo Bay Aqua-Line traffic: Vehicle movement along the Tokyo Bay Aqua-Line, influenced by tolls, congestion, and weather. Traffic levels reveal how the crossing serves regional travel and responds to demand.
Kawasaki: A major city in Kanagawa Prefecture, Japan, between Tokyo and Yokohama. The Aqua-Line’s western landfall connects the crossing to Kawasaki.
Immersed tube tunnel: A tunnel made by sinking prefabricated sections into a prepared trench and joining them underwater. The Aqua-Line used a different tunneling approach rather than a sunk prefabricated tube.
Nippon Road Public Corporation: A former Japanese public corporation responsible for constructing and managing national expressways. The corporation oversaw the Aqua-Line’s construction.
Aqua-Line bus services: Express bus routes using the Tokyo Bay Aqua-Line to connect destinations around Tokyo Bay. Buses use the crossing to link Kisarazu with Tokyo, Kawasaki, and other urban centers.
Kisarazu: A city in Chiba Prefecture, Japan, on the eastern shore of Tokyo Bay. The Aqua-Line reaches the Bōsō Peninsula at Kisarazu.
Tunnel boring machine: A machine that excavates tunnels while supporting the surrounding ground. Large tunnel boring machines excavated the Aqua-Line’s undersea road tunnels.

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