Deck Joints are designed to:

• A. Provides a smooth riding surface and protects the deck
• B. Carries the traffic
• C. Removes water from the bridge
• D. Accommodate the expansion, contraction and rotation of the superstructure

Answer: (D)

Deck joints are designed to accommodate movement between deck sections and the bridge superstructure caused by temperature changes and applied loads. As the bridge heats and cools, and as traffic loads shift, different parts move relative to one another; the joints provide a controlled gap that can widen, narrow, or rotate without forcing cracking or binding in the deck or girders. This movement capacity is essential to protect the structure and maintain a proper riding surface. The joint’s primary job isn’t to carry traffic, drain water, or create a smooth riding surface—that’s handled by the deck surface and drainage system. Therefore, allowing expansion, contraction and rotation is the correct purpose.