Of all of the projects that I just don't get, this is one (outside of the benefit for the shared use path). Especially going north, there's a ton of extra ROW. The part that is crazy for me is where it goes from four lanes, then back to three (Park St. Exit Only), then immediately back to four. There's more than enough room to shrink to adjust the Park Street Exit so all four lanes can exist.
That entire interchange uses so much ROW unnecessarily it's crazy. I bet if you told them to work with existing ROW and add no ramps, they'd get 80% of the improvement.