I took a bike ride through the Chateau Neighborhood of Pittsburgh the other day. I always wish that area was of the same developmental value that other areas are. It's essentially a blank slate for developers, with great access to the river, as well as the north shore, "Amenities." The only problem that stands in the way is PA-65. However there was talk, after the movepgh plan, of doing the equivalent of the, "Big Dig" to that area, minus the tunnel.
They would use the existing 2-3 lane streets (
https://www.google.com/maps/place/40%C2%...mH-nBngevYuuvCt0dg!2e0!4m2!3m1!1s0x0:0x0) on the side of the road to take the traffic, re-connect the side streets, and include bike and pedestrian infrastructure. Looking at a PA-Traffic map, that road is used, in one day, about 32,000 cars per day (
ftp://ftp.dot.state.pa.us/public/pdf/BPR...ffic_Volume/County_Maps/Allegheny_tv.PDF) , which, with some traffic reduction and calming, could be accommodated by those roads.