This project section is 4 miles in length and includes widening the existing turnpike mainline to accommodate six 12’ lanes with 12’ on the inside and outside shoulders. Also included in this section’s design are overhead and mainline structure (such as bridges and overpasses) replacements. The section begins just west of the Saltsburg Bridge in Plum Borough and extends to Northern Pike Road in the Municipality of Monroeville and includes the Pittsburgh Interchange.
This project is one of three sections within 18 miles of continuous expansion that includes mainline reconstruction and widening, geometry improvements and overhead/mainline bridge replacements. The mainline reconstruction and widening plan is to widen
all east- and west-bound travel lanes from two to three in each direction. The limits of this corridor are from Milepost 49 at Oakmont Country Club to Milepost 67 at Irwin Interchange. Below is a graphic showing the roadway configuration before and