Long span structures are structures that span a distance of more than 15 meters (50 feet). Examples of long span structures include suspension bridges, cantilever bridges, arch bridges, cable stayed bridges, stadiums, domes, roofs, and large tents. Many of these structures are made of steel, concrete, or a combination of the two. They are designed to support heavier loads than traditional structures and are often used to span rivers, valleys, or other large bodies of water. The advantage of long span structures is that they can span large distances without the need for intermediate supports, allowing for open spaces between the supports and reducing the amount of material needed. This also reduces the amount of labor required for construction and maintenance. Additionally, long span structures can provide aesthetic benefits, such as when an arch bridge is used to span a river.