36 Pa. Stat. § 3521
The Governor of the Commonwealth of Pennsylvania shall, upon the passage of this act, appoint three citizens of this Commonwealth, who shall constitute a commission to be known as the Delaware River Bridge and Tunnel, and to act, in conjunction with a similar commission or commissions of any other State of States contiguous to this Commonwealth, as a joint commission for the planning and construction of one or more bridges or tunnels, such as may be suitable or necessary, to provide passage for traffic over or under all navigable streams or rivers which partially bound any county or counties of this State, and which streams or rivers are boundaries of the State. Said commission may also act as an independent commission for said purposes should in the judgment of the commission it be convenient or necessary.
36 P.S. § 3521