Which bridge type is described as the deck located in the middle of the main structure?

• A. Through Bridge
• B. Deck Bridges
• C. Cantilever Bridges
• D. Half-Through Bridge

Answer: (D)

The key idea is how the roadway is positioned inside the bridge’s truss. If the deck sits right in the middle of the height of the main structure, you’re looking at a half-through (semi-through) truss bridge. In this arrangement, part of the truss rises above the deck and part sits below it, so the traffic sits between the upper and lower chords rather than entirely below or through an open framework. This contrasts with a through-truss bridge, where the roadway is lower and you pass through the truss openings, and with a deck-truss (deck on top of the truss), where the deck is above the truss. So the described mid-height deck best fits the half-through configuration.