What type of force do arch bridges best resist?

Arch bridges best resist compressive forces. The design of an arch distributes the weight of the bridge and its loads along the curve of the arch, transferring the forces down into the supports at either end. This allows the structure to effectively manage the stresses without buckling, making it ideal for spanning large distances. Additionally, the inherent shape of the arch helps to counteract any lateral forces such as wind or seismic activity.