36 Pa. Stat. § 669.2
In order to facilitate vehicular traffic in the southwestern section of the Commonwealth, the Pennsylvania Turnpike Commission heretofore created by virtue of the provisions of the act of May twenty-one, one thousand nine hundred thirty-seven (Pamphlet Laws 774), and the supplements and amendments thereto, is hereby authorized and empowered to construct, operate and maintain a turnpike, at such location as shall be approved by the Governor and the Department of Highways, from a connection with the Pennsylvania Turnpike System, at or near a point west of or east of the City of Pittsburgh as the Pennsylvania Turnpike Commission may decide is most feasible and practicable, thence in a general southerly direction to the West Virginia border to connect with the West Virginia Turnpike, or any extension thereof, at such point as the Pennsylvania Turnpike Commission may decide is the most feasible and practicable, together with connecting roads, tunnels and bridges; and to issue turnpike revenue bonds of the Commonwealth, notes or other obligations, payable solely from revenues of the Commission, including tolls, or from such funds as may be available to the Commission for that purpose, to pay the costs of such construction.
36 P.S. § 669.2