A swing bridge is a type of movable bridge that rotates horizontally around a pivot point to allow boats and ships to pass through. This design is particularly useful in areas where a fixed bridge would obstruct water traffic. Swing bridges can be found in various locations, often spanning rivers or canals. The mechanism of a swing bridge typically involves a counterweight system that helps balance the bridge as it swings open and closed. These bridges are often operated manually or through automated systems, ensuring safe and efficient passage for both vehicles and vessels. Examples of swing bridges include the Baker Street Bridge and the Chicago River Swing Bridge.