You know what costs even less? Not proceeding with the damned widening project in the first place. How's that for Value Engineering?
For a pedestrian bridge, you're looking at a live load of 100 psf [[equivalent to the self-weight of an 8" thick concrete slab). That's not my GUESS--that is the minimum requirement of ASCE-7.
Never mind that, at a 60-foot span, you have serious serviceability considerations [[deflections, vibrations). So go ahead--"pretty much" design around the dead load, and see how many people die. Engineering is a freaking piece of cake, right?
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