(a) No person shall stop, stand or park any vehicle other than a commercial vehicle in any place marked as a truck zone during the hours when such zone is reserved for loading purposes.
(b) No person shall stop, stand or park a commercial vehicle for any purpose or length of time other than for the expeditious unloading and delivery or pick-up and loading of materials in any place marked as a truck zone during the hours when the provisions applicable to truck zones are in effect. In no case shall the stop for loading and unloading of materials exceed thirty minutes. (Ord. 1950-16. Passed 3-27-50.)