First off, where is the room to put in the bent support on the side of the existing corridor to support the main bean to support this idea??
Second, no room to put in centre bents without removing tracks 100% and DOA by Metrolinx right off the bat,
Three is o have Beams sitting on side bents will have be assemble in one piece to be lifted by a number of cranes, but most of all, the underside if the beam has to be 35 feet above the track.
Four: Given the span, the weight of 6-8 lanes of traffic, the depth of the beam could be 15 feet or more and leave that to the engineers who may have a better idea.
Five: Given the length of the supporting beam, where do assembly these monster beams??
Six: You need to move the ramps to/from the DVP further north due to the increase of height as well make various changes to the Gardiner to get to the new height that will require the closing of the Gardiner up to a year.
Seven: Metrolinx will require strict protection over the corridor at all times that will not interfere with train movement or nighttime work.
As far as I am concern, time to remove the eastern section regardless if means an extra 5-10 minute trave time on the ground and save everyone money not have to pay taxes to cover the yearly cost to maintain it as well built the plan new one. Only 25-35,000 vehicles use that section in the first place.