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Bridge

structure built to span physical obstacles
Iron Bridge, 1781, was the first cast iron bridge
Bridge crossing river d'Ebre, Catalonia.
The longest suspension bridge in the world connects Honshu to Shikoku, Japan.

A bridge is a structure to cross an open space or gap. Bridges are mostly made for crossing rivers, valleys, or roads. Nowadays most big bridges are made to carry vehicles but people have also walked across bridges for thousands of years. Bridges called highway overpasses carry a road over another road.

Military bridges are portable, so that they may be easily moved to where they are needed. This makes them much more complex than most civilian bridges.

The first man-made bridges were probably made from cut wood or stones.

Types of bridgesEdit

There are five major structural types of bridges:

NotesEdit

  Media related to Bridges at Wikimedia Commons

  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.