36 Pa. Stat. § 2391.9
The authorities responsible for the maintenance of limited access highways shall have exclusive jurisdiction over the control of the use of such highways, and, by the erection of appropriate signs, may control the ingress and egress of vehicles thereto, therefrom and across, the speed of vehicles thereon, and the parking of vehicles thereon and under elevated portions thereof, or may exclude any class or kind of traffic therefrom, and, by the erection of signs or the construction of curbs, painted lines, or other physical separations, provide separate traffic lanes for any class of traffic or type of vehicle: Provided, however, That nothing herein contained shall restrict the authority or jurisdiction of any peace officer as defined in The Vehicle Code from enforcing such control over traffic or parking as have been or may be established for limited access highways: And provided further, That the provisions of The Vehicle Code not superseded by the provisions of this act shall be and remain in full force and effect for the use and operation of motor vehicles on limited access highways. It shall be unlawful for any person to violate any parking or speed restriction or traffic control established for a limited access highway as provided herein, and any person violating such restriction or control shall, in a summary proceeding, be subject to a fine of not less than five ($5) dollars nor more than twenty-five ($25) dollars and costs of prosecution or imprisonment for one day for each dollar of fine and costs remaining unpaid.
36 P.S. § 2391.9