(a) Any commissioner, officer, agent, or employee of any district who shall wilfully fail or refuse to comply with, or who shall knowingly violate, any of the provisions of this subchapter, shall be guilty of a misdemeanor, and shall be punished by a fine of not less than one hundred dollars ($100) nor more than five hundred dollars ($500).
(b) The provisions of this subchapter may be enforced by mandamus at the instance of the State Highway Commission or of any interested landowner.