Which joint design is intended to adjust its length to accommodate movement or deformation and ensure continuous traffic between bridge structures and interconnecting structures?

• A. Small movement joints
• B. Rubber joints
• C. Bridge expansion joints
• D. Medium movement joints

Answer: (C)

Expansion joints are designed to lengthen or shorten as the structure moves or deforms, keeping a continuous, smooth traffic path between bridge sections and any connected structures. They use sliding or modular elements that can extend, compress, and accommodate differential movement from temperature changes, loads, or shifting foundations, so vehicles can pass without interruptions while the deck remains effectively connected. This capability to adjust length and maintain a continuous riding surface is what distinguishes bridge expansion joints from other types, which may handle only limited movement or serve different purposes (like sealing or isolation) and wouldn’t reliably accommodate the full range of bridge and interconnecting-structure movement.