No person shall stop, stand or park a truck licensed commercial vehicle for any purpose or length of time other than for the expeditious unloading and loading of property in a truck load zone during the hours the zone restriction is in effect, and then in no case shall such parking for loading and unloading of property exceed thirty minutes. No person shall stop, stand or park a vehicle in a truck loading zone which vehicle is not a truck licensed commercial vehicle. (Ord. 2180-96 § 15, 1996.)