The traffic engineer may establish loading zones for the loading and unloading of material at Love Field and Dallas Executive Airport. A person commits an offense if he stops, stands, or parks a vehicle in a loading zone other than for the expeditious unloading and delivery or for the pick-up and loading of material. A person may stop or stand in a loading zone for the purpose of loading or unloading materials for a period not to exceed 15 minutes except on written permission from the director of aviation for a longer period, limited to the time necessary to complete one undertaking. (Ord. Nos. 14584; 24859)