THE BRIDGE The bridge is a structure built to span a valley, road, river, or any other physical obstacle. There are three major types of bridges: The beam bridge The arch bridge The suspension bridge The main difference between the three above is the distances they can cross in a single span. Click here to find more about bridges.

THE TUNNEL The tunnel is a a passageway through or under something, usually underground. Before cars and trains, the tunnels carried only water. These were created by the Roman engineers. Today, the mountain or the ocean is not an obstacle for a tunnel. The tunnel boring machines can be used to automate the entire tunneling process. Click here to find more about tunnels.

BRDIGE VS TUNNEL For water crossings, a tunnel is generally more costly to construct than a bridge. For weight capacity reasons it may be more feasible to build a tunnel than a sufficiently strong bridge. The tunnel or the bridge? Click here and find out.