International engineering firm (Think Bechtel, Haliburton) Parsons Brinkerhoff has a, uh, timely, release of a simulation of the collapse of the Seattle Viaduct.
Consider however that the quickest way to get the Viaduct DOWN SAFELY is the surface option, also fully budgeted!
(With a surface option there should be some sort of special treatment for trucks - for the Port and NW Seattle Businesses)
