Quote:
Originally Posted by polishavenger
How does sweeping around result in only a few short bridge structures? It looks to me like its one very long bridge. You can align the more direct bridges in such a way as to cross at relatively low points, meaning all that would happen is one or two additional support columns.
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In this case it is long sweeping bridges in the ultimate plan, likely for a couple reasons. First is design speed, second is to provide adequate separation between the ramps on blackfoot and deerfoot, and third probably relates to where they would need to position the piers for the bridges. Mazrim is right that it would be more costly to do a more direct offramp, but you're going to end up with a triple layer stacked interchange and its usually more cost efficient to double the length of a bridge rather then double its height.