Title 75, Section 4901(d) reads as follows:
(d) Responsibility of local authorities.--Local authorities:
(1) that have adopted an ordinance under this chapter;  or
(2) that establish or enforce size or weight limitations which differ from those provided for in this chapter; have the burden and responsibility to properly administer, adhere to and enforce compliance with the requirements of this chapter and the regulations of the department.  Failure of a local authority to properly administer, adhere to or enforce the substantive requirements of this chapter and the department's regulations shall subject the local authority to penalties set forth under section 4907 (relating to penalty for violation of chapter).

Penalty for Violation of chapter - 4907(e)
Failure to properly administer, adhere to and enforce the requirements of this chapter.--When it is determined in a summary proceeding that a local authority has failed to comply with any of the requirements of this chapter or the department's concomitant regulations, the following shall occur:
(1) The local authority shall be liable for the costs for scheduling and conducting the proceeding and for the reasonable costs incurred to respond to and defend against the charges. The costs shall be assessed by the magisterial district judge and payable within 30 days of assessment.
(2) The local authority shall forfeit any right of recovery for the cost of any repairs and restoration necessitated by the movement of vehicles upon highways or bridges.