36 Pa. Stat. § 670-205
The department shall have the power to enter upon any lands or enclosures for the purpose of making surveys to assist the department in determining whether any State highway should be relocated, widened or improved, and all surveys in connection with the actual relocation, widening or improvement of any State highway. Any entry made by any duly authorized employes of the department, for any such purpose, shall not be deemed a trespass under existing law.
Any damages sustained by the owned or owners of land entered upon by the department for the purpose herein provided shall be determined and paid in the manner provided by law for the payment of damages to property heretofore or hereafter caused or occasioned in connection with the work of the department in the construction, improvement, maintenance, and repair, or in the preparation of materials for such purpose, of roads, highways or bridges under the jurisdiction of the department, and for which the Commonwealth is responsible for maintenance, and attributed to negligence or carelessness on the part of the employes of the department.
Any person interfering with or obstructing the exercise of the authority herein conferred, shall, on summary conviction thereof, be sentenced to pay a penalty, for every such offense, of not less than five dollars nor more than twenty dollars. All penalties imposed under this section shall be transmitted to the State Treasury of the Commonwealth, and shall be credited to the Motor License Fund. The penalty herein provided shall be in addition to, and not in lieu of, any penalties imposed by existing law.
36 P.S. § 670-205