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There are three main bridge areas which include all the basic components of bridge: Foundation, Substructure, and Superstructure. Bridges are complex structures, and since they can be made with many different materials and truss types, their components are almost too numerous to count. Here you can get informed about basic bridge parts and components.
To enable better utilization of truss structures, engineers and architects from all around the world have devised many types of trusses that can be used for the creation of incredible amount of structures. You can learn more about those truss designs and benefits of truss use here.
Footbridge is a bridge for pedestrians. It is often simple (although it doesn't have to be) and its purpose is to take pedestrians over some obstacle like a river, road traffic or a railroad.
Suspension bridges are relatively modern invention (at least those that are built to be large). They are cheaper and can have longer spans but can’t sustain as much weight as other types of bridges. Here are some variants of suspension bridges.