The provisions of this title regulating the parking or standing of vehicles shall not apply to any vehicle of a City department or public utility while necessarily in use for construction or repair work or any vehicle owned or operated by the United States Post Office while in use for the collection, transportation or delivery of United States mail. (Ord. 2670 § 1, 1996; Ord. 973 § 1, 1966; prior code § 19.3.3(C)).