What is the primary purpose of a bridge's superstructure?

The primary purpose of a bridge's superstructure is to support vehicles and loads above the ground. The superstructure includes the components of the bridge that carry the traffic load, such as beams, girders, and the deck. Its primary function is to distribute the weight from the vehicles and loads on the bridge to the piers and abutments, ensuring that the structure remains stable and functional while serving its primary role of facilitating safe transportation across obstacles such as rivers or valleys.

While aesthetics and connections between roadways are important considerations in bridge design, they do not define the primary structural role of the superstructure. Additionally, the foundation, which is designated to support the bridge, is a separate entity from the superstructure and includes the substructure components, such as piers and footings. The emphasis of the superstructure is purely on load-bearing and maintaining structural integrity during use.