Topic summary
Deck truss
Extracted from the Wikipedia article Truss bridge.
Deck types
The truss may carry its deck on top, in the middle, or at the bottom of the truss. Bridges with the deck at the top or the bottom are the most common as this allows both the top and bottom to be stiffened, forming a box truss. When the deck is atop the truss, it is called a deck truss; an example of this was the I-35W Mississippi River bridge. When the truss members are both above and below the deck it is called a through truss; an example of this is the Pulaski Skyway, and where the sides extend above the roadbed but are not connected, a pony truss or half-through truss.