Which joint type is specifically designed to accommodate large movements and support traffic across gaps?

• A. Large movement joints
• B. Expansion joints
• C. Seismic joints
• D. Sliding joints

Answer: (A)

Joints in bridges must let the deck move when temperatures change or loads shift, while still giving drivers a smooth, continuous surface. When the movement across a gap is large, you need a joint type that is specifically built to handle big displacements and to carry traffic across that gap. Large movement joints are designed for exactly that: wide openings and robust closure systems that accommodate substantial relative movement between deck segments while providing a surface that vehicles can cross safely. They differ from standard expansion joints, which handle more modest thermal expansion and contraction; seismic joints, which primarily absorb movement during earthquakes; and sliding joints, which rely on sliding interfaces and aren't typically used to bridge very large, regularly loaded gaps. So the best fit for large movements across gaps with traffic is large movement joints.