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The bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2] In American English, the term is synonymous with drawbridge , and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers to only a ...
A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
The center span between the two suspension towers is 1,380 feet (421 m) long, [16] [17] and the side spans between the suspension towers and the anchorages are each 700 feet (213 m) long. [16] The total length of the bridge is 2,780 feet (847 m), and the deck is 98 feet (30 m) wide. [ 16 ]
Opened in 1957, the 26,372-foot-long (4.995 mi; 8.038 km) [1] bridge is the world's 27th-longest main span and is the longest suspension bridge between anchorages in the Western Hemisphere. [5] The Mackinac Bridge is part of Interstate 75 (I-75) and carries the Lake Michigan and Huron components of the Great Lakes Circle Tour across the straits ...
Some bridges are measured from the beginning of the entrance ramp to the end of the exit ramp. Some are measured from shoreline to shoreline. Yet others use the length of the total construction involved in building the bridge. Since there is no standard, no ranking of a bridge should be assumed because of its position in the list.
The bascule span of the bridge, which opens up southwards when required, [32] lies around 12 metres (39 ft) above water level during high tides, [33] with the space between the two main spans in the water being around 35 metres (115 ft) - safety features fitted to the span walls limit shipping with a maximum width of 32 metres (105 ft) to be ...
The tunnel is 76 feet (23 m) wide, 58 feet (18 m) high, and 540 feet (160 m) long. [15] It is the largest diameter transportation bore tunnel in the world. [ 22 ] The large amount of material that was excavated in boring the tunnel was used for a portion of the landfill over the shoals lying adjacent to Yerba Buena Island to its north, a ...