Editing Bridge (section)

===Double-decked bridges{{Anchor|Double-decked}}===
{{See also|List of multi-level bridges}}
[[File:George Washington Bridge from New Jersey-edit.jpg|thumb|The double-decked [[George Washington Bridge]], connecting New York City and [[Bergen County, New Jersey]], is the world's busiest bridge, carrying 106 million vehicles annually.<ref name="panynj.gov">{{cite web |url=http://www.panynj.gov/bridges-tunnels/george-washington-bridge.html |access-date=14 February 2023|title=Port Authority of New York and New Jersey – George Washington Bridge |publisher=The Port Authority of New York and New Jersey |url-status=live |archive-url=https://web.archive.org/web/20130920192211/http://www.panynj.gov/bridges-tunnels/george-washington-bridge.html |archive-date=20 September 2013}}</ref>]]

Double-decked (or double-decker) bridges have two levels, such as the [[George Washington Bridge]], connecting New York City to [[Bergen County]], [[New Jersey]], US, as the world's busiest bridge, carrying 102 million vehicles annually;<ref name="panynj.gov"/><ref name=abcgwb>{{cite web|url=https://abcnews.go.com/US/george-washington-bridge-painters-dangerous-job-top-worlds/story?id=17771877|title=GW Bridge Painters: Dangerous Job on Top of the World's Busiest Bridge|author1=Bod Woodruff|author2=Lana Zak|author3=Stephanie Wash|name-list-style=amp|work=ABC News|date=20 November 2012|access-date=13 September 2013|url-status=live|archive-url=https://web.archive.org/web/20130928002159/https://abcnews.go.com/US/george-washington-bridge-painters-dangerous-job-top-worlds/story?id=17771877|archive-date=28 September 2013}}</ref> [[truss]] work between the roadway levels provided stiffness to the roadways and reduced movement of the upper level when the lower level was installed three decades after the upper level. The [[Tsing Ma Bridge]] and [[Kap Shui Mun Bridge]] in Hong Kong have six lanes on their upper decks, and on their lower decks there are two lanes and a pair of tracks for [[MTR]] metro trains. Some double-decked bridges only use one level for street traffic; the [[Washington Avenue Bridge (Minneapolis)|Washington Avenue Bridge]] in [[Minneapolis]] reserves its lower level for automobile and light rail traffic and its upper level for pedestrian and bicycle traffic (predominantly students at the [[University of Minnesota]]). Likewise, in [[Toronto]], the [[Prince Edward Viaduct]] has five lanes of motor traffic, bicycle lanes, and sidewalks on its upper deck; and a pair of tracks for the [[Bloor–Danforth line|Bloor–Danforth]] [[Toronto subway and RT|subway line]] on its lower deck. The western span of the [[San Francisco–Oakland Bay Bridge]] also has two levels.

[[Robert Stephenson]]'s [[High Level Bridge, River Tyne|High Level Bridge]] across the [[River Tyne]] in [[Newcastle upon Tyne]], completed in 1849, is an early example of a double-decked bridge. The upper level carries a railway, and the lower level is used for road traffic. Other examples include [[Britannia Bridge]] over the [[Menai Strait]] and [[Craigavon Bridge]] in Derry, Northern Ireland. The [[Øresund Bridge|Oresund Bridge]] between [[Copenhagen]] and [[Malmö]] consists of a four-lane highway on the upper level and a pair of railway tracks at the lower level. [[Tower Bridge]] in London is different example of a double-decked bridge, with the central section consisting of a low-level [[Bascule bridge|bascule span]] and a high-level [[footbridge]].