The diagrams illustrate three types of bridges, including arch bridges, concrete girder bridges and suspension bridges. Overall, each of them showcases the differences, explaining detailed characteristics.
The first picture shows the structure of arch bridges, which are built with bricks over lakes. They are usually up to 200m wide and their bases cannot be more than 100m from the surface of the lake. They leave a space for small ships to go through underneath.
The second illustration gives information about concrete girder bridges. In contrast to the arch bridges, these are constructed over rivers, with no limitation of the width, although they cannot be higher than 300m from the bottom of the river. This type of bridges can be elongated by adding piers that support the main part of the bridge, in which cars drive on. Each pier is places every 200m or less and ships that are middle-sized can go through between them.
The picture presented lastly is suspension bridges. They are made to connect lands that are separated by sea and normally between 400 and 2000 metres long. Two piers that grow from the shore support the bridge and large sized ships can go through. The distance from seabed can be significantly long.