On the city data forum for Pittsburgh, there was a recent post about a revamped Ross Township Historical Society facebook page. There is a alum with 60 photos from the construction of McKnoght Road, 1940-1946. One pic has a photo of the neighborhood I grew up in from 1946. We lived along the ridgeline on the right in the house with the 2 storey gable over the entrance. The home was built in 1938, demolished in 1977 along with all the other homes in the picture.
Back in the 70's the plan was to preserve the existing McKnoght Road bridge that was only in it's 20's in age. To do so, the ramp from McKnight south to 279 was to take a much wider swing to the west and cross under Ivory Ave via it's own shorter bridge. This plan was dropped when the HOV lanes came into being. I am very certain that the current plan would have spared most of the homes in the picture.
https://www.facebook.com/groups/335649016485767/photos#!/photo.php?fbid=10150593893939141&set=oa.335771596473509&type=1&theater
Wow. Lots of neat old photos in that album.