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with a combination of bridges and tunnels across two widely separated shipping channels, using four artificial islands built in the bay as portals. Tunnels had to be used instead of drawbridges because the waterways they cross are critical to military naval operations
343:(the route's path passes the ends of some of the runways; the minimum practical height for a bridge would have interfered with airplanes using those runways) and the perennial threat of ice (a bridge's columns would have encouraged
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In other instances, when longer distances are involved, a bridge–tunnel may be less costly and easier to ventilate than a single, lengthy tunnel. This situation may occur when more economical
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For water crossings, a tunnel is generally more costly to construct than a bridge. However, navigational considerations at some locations may limit the use of high bridges or
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which replaces ferry service. Fixed links are often, but not necessarily, intercontinental links between continents or transoceanic links to offshore islands.
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Ostenfeld, Klaus H.; Hommel, Dietrich; Olsen, Dan; Hauge, Lars (Nov 4, 1999). "Planning of Major Fixed Links". In Chen, Wai-Fah; Lian, Duan (eds.).
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from the north bank to the south bank via two islands and is about 65 km (40 mi) in total length.
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are not allowed for one reason or another. For example, in the
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in China is a tunnel-bridge-bridge complex, consisting of the
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strait, and a 4 km (2.5 mi) tunnel nearest to
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is nearby, and
Chesapeake Bay provides access to the
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155:connection across water that uses a combination of
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814:List of lists of covered bridges in North America
401:and connecting viaducts at the river's mouth in
327:. It has a 7.8 km (4.8 mi) bridge, an
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424:Intercontinental and transoceanic fixed links
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395:longest cable-stayed bridges in the world
120:Learn how and when to remove this message
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285:Monitor–Merrimac Memorial Bridge–Tunnel
354:is a bridge–tunnel combination across
399:Chongming–Qidong Yangtze River Bridge
383:longest crossing on the Yangtze River
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287:, both of which cross the harbor at
58:adding citations to reliable sources
27:Road or rail connection across water
429:bridge and tunnel (disambiguation)
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782:medieval stone bridges in Germany
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341:Copenhagen International Airport
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405:. This fixed link carries the
347:which could block the strait).
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739:Visual index to various types
407:G40 Shanghai–Xi'an Expressway
391:Shanghai Yangtze River Bridge
387:Shanghai Yangtze River Tunnel
279:, such crossings include the
178:Bridge–tunnels are a form of
562:Cantilever spar cable-stayed
293:Chesapeake Bay Bridge–Tunnel
451:Bridge Engineering Handbook
281:Hampton Roads Bridge–Tunnel
252:between the twin cities of
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362:. It connects the city of
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190:Tunnels and bridge–tunnels
147:is a persistent, unbroken
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850:Continuous truss bridges
823:Lists of bridges by size
760:Lists of bridges by type
315:Another example is the
809:List of bridge–tunnels
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577:Double-beam drawbridge
419:List of bridge–tunnels
196:List of bridge–tunnels
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802:vertical-lift bridges
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331:in the middle of the
302:Naval Station Norfolk
194:Further information:
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860:Masonry arch bridges
840:Cable-stayed bridges
246:Cross-Harbour Tunnel
234:George Massey Tunnel
226:Portsmouth, Virginia
204:spans when crossing
54:improve this article
787:multi-level bridges
368:Kanagawa Prefecture
352:Tokyo Bay Aqua-Line
845:Cantilever bridges
835:Suspension bridges
777:cantilever bridges
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329:artificial island
238:Greater Vancouver
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43:This article
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18:Bridge-tunnel
855:Arch bridges
797:toll bridges
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713:Through arch
547:Cable-stayed
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52:Please help
47:verification
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657:Transporter
637:Submersible
622:Retractable
269:drawbridges
169:drawbridges
696:Suspension
612:Drawbridge
582:Extradosed
557:Cantilever
542:Burr Truss
532:Box girder
435:References
291:, and the
273:U.S. state
244:, and the
216:under the
202:drawbridge
180:fixed link
80:newspapers
830:By length
669:Multi-way
456:CRC Press
356:Tokyo Bay
262:Hong Kong
165:causeways
940:Category
925:Category
689:Vlotbrug
602:Moveable
413:See also
403:Shanghai
372:Kisarazu
364:Kawasaki
345:ice dams
283:and the
277:Virginia
254:Victoria
220:between
900:Related
870:Tallest
865:Highest
733:Viaduct
728:Tubular
718:Trestle
684:Pontoon
627:Rolling
617:Folding
607:Bascule
567:Covered
337:Denmark
333:Øresund
325:Denmark
258:Kowloon
228:in the
222:Norfolk
173:ferries
161:tunnels
157:bridges
94:scholar
708:Timber
552:Canopy
507:Bridge
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321:Sweden
248:under
242:Canada
232:, the
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647:Table
642:Swing
360:Japan
101:JSTOR
87:books
679:Pile
652:Tilt
597:Moon
572:Crib
527:Beam
522:Arch
460:ISBN
381:The
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256:and
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153:rail
149:road
136:The
73:news
592:Log
587:Jet
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