Which type of joints are designed to adjust their length to accommodate movement or deformation and allow continuous traffic between bridge structures?

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

Answer: (B)

Expansion joints are designed to accommodate changes in deck length due to temperature, loading, and movement, while keeping the roadway continuous between bridge segments. They bridge the gap between spans and allow relative motion so the surface remains smooth for traffic as the structure expands or contracts. This sliding or sliding-sealing interface can extend or compress to absorb substantial movement without opening gaps in the traffic path. Other joints may handle smaller movements or mainly seal the joint, but they aren’t built to span and adapt to the full range of movement needed to maintain a continuous road surface across bridge structures.