Changes

* Verrazano Narrows Bridge, New York 4,260 feet (1,299 meters),  built in 1964 <ref>http://goldengatebridge.org/research/facts.php</ref>

* Verrazano Narrows Bridge, New York 4,260 feet (1,299 meters),  built in 1964 <ref>http://goldengatebridge.org/research/facts.php</ref>

The suspension design of the bridge was chosen to help it withstand an earthquake. A suspension bridge suspends the roadway from the main cables, which extend from one end of the bridge to the other. These cables rest on top of high towers and are secured at each end by anchorages. The towers enable the main cables to be draped over long distances. Most of the weight of the bridge is carried by the cables to the anchorages, which are imbedded in either solid rock or massive concrete blocks. Inside the anchorages, the cables are spread over a large area to evenly distribute the load and to prevent the cables from breaking free.<ref>http://www.pbs.org/wgbh/nova/bridge/meetsusp.html</ref><ref>http://www.answers.com/topic/golden-gate-bridge</ref>

The suspension design of the bridge was chosen to help it withstand an earthquake. A suspension bridge suspends the roadway from the main cables, which extend from one end of the bridge to the other. These cables rest on top of high towers and are secured at each end by anchorages. The towers enable the main cables to be draped over long distances. Most of the weight of the bridge is carried by the cables to the anchorages, which are imbedded in either solid rock or massive concrete blocks. Inside the anchorages, the cables are spread over a large area to evenly distribute the load and to prevent the cables from breaking free.<ref>https://www.pbs.org/wgbh/nova/bridge/meetsusp.html</ref><ref>http://www.answers.com/topic/golden-gate-bridge</ref>

== Seismic Retrofit ==

== Seismic Retrofit ==