(a) No person shall be subject to a fine or other penalty for the offense of overtime parking incurred while the person is engaged in actual service as a grand or petit juror in any court, federal or state, in this state.
(b) The person may evidence the fact of jury service by exhibiting to the appropriate official of the city or town offended by the violation a certificate of the clerk of the court similar to the form now in use to the effect that the person was engaged in jury service on the date of the violation and the hours of actual service.
(c) Any person attempting to enforce any fine or other penalty notwithstanding the provisions of this section shall be subject to contempt proceedings before the judge of the court being served by the person so charged.
(d) Nothing contained in this section shall be construed to give immunity from fine or penalty other than for the offense of overtime parking.