Supporting towers, also known as trestles, are structures used to support bridges, buildings, and other structures. They are typically made of steel or wood and are designed to bear the weight of the structure they are supporting. Trestles are often used in construction projects, such as bridge building, to provide a stable foundation for the structure. They can also be used to support large signs or billboards. Trestles are an important part of many engineering projects and can be found in a variety of sizes and shapes.