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An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry links. [ 1 ]
The Tokyo Bay Aqua-Line (東京湾 アクアライン, Tōkyō-wan Akua-rain [9]), 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.
Submerged floating tunnels can be anchored to the seafloor (left) or suspended from a pontoon (right) A submerged floating tunnel (SFT), also known as submerged floating tube bridge (SFTB), suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy (specifically, by employing the hydrostatic thrust, or Archimedes' principle).
The Pan-American Highway from Prudhoe Bay, Alaska, to Quellón, Chile, and Ushuaia, Argentina, with official and unofficial routes shown in Mexico and Central and South America. A few selected unofficial routes shown through the United States and Canada as they existed in the early 1960s.
A special case together with Navarre, the Basque Country has received full powers over most roads in its territory, including the national roads that comprised the primary network, and nowadays only the AP-1 and the AP-68 are under the direct authority of the Spanish government as part of the Red de carreteras del Estado (National Road Network).
AP-8 viaduct in Eibar. AP-8 in Zarauz.. The Autopista AP-8 is a toll autopista in the north of Spain, crossing the Basque Country from east to west. It is known as the Autopista del Cantábrico (Spanish for 'Motorway of the Cantabrian', Basque: Kantauriko autobidea) and connects the French border with Bilbao via San Sebastián, Zarautz, Eibar and Durango.
El Camino Real (Spanish; literally The Royal Road, sometimes translated as The King's Highway) is a 600-mile (965-kilometer) commemorative route connecting the 21 Spanish missions in California (formerly the region Alta California in the Spanish Empire), along with a number of sub-missions, four presidios, and three pueblos.
Cross-Harbour Tunnel was completely suspended during protest in November 2019. The Hong Kong government used the operator model "Build Operate Transfer", or "BOT", for the implementation of the tunnel project; Financing and construction was the responsibility of a private enterprise, which was granted a concession to operate and collect tolls for 30 years.