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The style of bridge would also depend on the required clearance beneath it, and the potential for intermediate supports. A deck truss or deck girder reduces the clearance substantially, and trestles (whether wood or steel) require solid footing for their bents. If the bridge passes over something which must be protected from fuel or other spills, then a ballasted deck might be used; if it's just over a creek, it might be an open deck. There's a prototype for everything, I am sure, so you can go with your gut and use the bridge you feel like using, as long as it seems plausible.
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