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.
The first man-made bridges were probably made from cut wood or stones.
Types of bridges[change | change source]
There are five major structural types of bridges:
Notes[change | change source]
Media related to Bridges at Wikimedia Commons