Recently David shared this photo with me and provided the following information.
"Dedham Square Route 1 overpass, which has been completed so recently that it does not show up completed yet on Google Earth. Rt-1/VFW is almost a full 6 lanes over the bridge, so the construction is about 2x wider what would be needed at Forest Hills, but it shows clearly how MassDOT builds a stone-face overpass these days. You can see they did a pretty nice job, with lots of light and good (but hard to show/see) PMMs (pidgeon mitigation measures). As a Forest Hills overpass would be a lower speed, automobile-only parkway, MassDOT should spec. lower bridge roadway sidewalls and median barriers, which would lighten the aesthetics of the bridge."
I wonder how much this bridge cost - it might help us get a better feel for what the cost of a bridge at Forest Hills would be.