An Act to facilitate vehicular traffic across the Commonwealth by providing for the conversion, operation and maintenance of certain toll free roads to toll roads as turnpike extensions; conferring powers and imposing duties on the Pennsylvania Turnpike Commission; authorizing the issuance of turnpike revenue bonds, notes or other obligations of the Commonwealth, 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 cost of such turnpikes; providing that no debt of the Commonwealth shall be incurred in the exercise of any of the powers granted by this act; providing for the collection of tolls for the payment of such bonds, notes or other obligations, and for the cost of maintenance, operation and repair of the turnpikes; * * *.