Trestles are structures used to support bridges or elevated railways. They are typically made of wood, steel, or concrete and consist of a series of triangular frames that distribute weight evenly. This design helps to ensure stability and strength, making them ideal for spanning long distances. In addition to their use in transportation, trestles can also be found in construction and agriculture. For example, they are often used as supports for scaffolding or as bases for platforms. Their versatility and strength make them an essential component in various engineering projects, including those involving bridges and railways.