It shall be unlawful for any person to cause, allow, permit or suffer any vehicle to be parked, whether occupied or not, in any parking space provided for by this article, during the hours stated on the meter, when the adjacent meter indicates by mechanical device that the time paid for by the deposit of a coin or coins has expired. No vehicle shall be parked in violation of this section. (1978 L.M.C., ch. 7, § 2.)