A bridge with a single span typically has two abutments—one at each end of the span. These abutments provide both vertical and lateral support for the bridge. The abutments bear the vertical loads from the bridge, including the weight of the superstructure and any live loads. They also resist lateral forces such as wind loads and soil pressure, ensuring the stability of the bridge. The two abutments work together to support the entire structure and transfer the loads to the ground or foundation.