Bridges are structures designed to cross a lake, a wadi, a river ravine, or a sea by a road, a railroad or an aerodrome cale a Works of art.
Its rôle is, of course, to ensure communication between two points impossible to cross on the ground.
There are several types of bridges, and it depends on the nature of the crossing to be erected and the height or length to cross.
From antiquity the man to try to improve this technique which remains among the most important sectors in the damage of the civil engineering to reach the inaccessible place and for ease the communication of the indivédus.
