Bridge structure

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A bridge is a structure to cross an open space or gap. Bridges are mostly useful for crossing rivers, valleys, or roads by vehicles but people have also used bridges for a long time for walking. Bridges called highway overpasses are used to avoid traffic control.

Bridge crossing river d'Ebre, Catalonia.

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Bridges also have uses in the military. Military bridges have to be portable, so that they may be easily moved to the front lines, and so they are much more complex than regular civilian bridges.

## Types of bridges

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There are five major structural types of bridges:

* beam bridges[1]
* cantilever bridges,
* arch bridges[2]
* suspension bridges and
* cable-stayed bridges[3]

## Notes

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1. ↑ "Beam bridges". Design Technology. Retrieved 2008-05-14.
2. ↑ Glass, Amy. "Dubai to build world's longest arch bridge". Arabian Business. Retrieved 2008-05-14.
3. ↑ Johnson, Andy. "Cable Stay vs Suspension Bridges". U.S. Department of Energy.

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Civil engineering

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