Which bridge type is described as the most common, inexpensive, and simplest structure supported between abutments or piers, where the force of compression pushes the load toward the middle?

• A. Arch Bridge
• B. Suspension Bridge
• C. Cantilever Bridge
• D. Truss Bridge

Answer: (A)

Compression drives the load path in an arch bridge. When weight sits on the deck, the arch carries that load mainly as compression along its curved shape, directing the forces toward the supports at each end. This efficient transfer of load allows the structure to be built with relatively simple, economical materials (like masonry or concrete) and with fewer components. That combination—that the arch naturally handles compression well, uses straightforward construction, and transmits forces efficiently to the abutments—explains why it’s described as the most common, inexpensive, and simplest option for bridges spanning between abutments or piers. Other types rely on tensioned cables, long cantilevers, or lattice frameworks, adding complexity and cost compared to a plain arch.