The northbound to eastbound fly over could have been done much shorter and using more of the run on the ground. So first less prone to icing, second costs less in original construction and third less costly to maintain over time. It probably was done so the eventual northbound to westbound flyover could split off of it and go over the westbound to southbound flyover but at this point the only benefit of the extra height is you have gravity on your side when you are getting to the points needing acceleration.
Bookmarks