Subject to any provision prohibiting parking at all times or during specified hours, vehicles used for the transportation of merchandise or materials may stand or be parked at the curb to take on or discharge loads on any street marked for parallel parking: provided, that such vehicles may be backed into any curb at such times and places when and where the same may not interfere with or become a hazard to vehicular traffic on such street within the block: provided further, that traffic may be temporarily blocked by any such vehicle backed into any curb to load or unload when the same may be necessary during such times as loading or unloading shall be undertaken in an expeditious manner without any delay, upon prior notice to and under the direction and supervision of the Police Department: provided further, that the driver or some person in charge of such vehicle shall constantly be present or available to remove such vehicle in an emergency and the vehicle shall be removed immediately upon the same being loaded or unloaded as the case may be. The Chief of Police may place suitable warning signs to direct or control traffic during the time any street may be blocked or traffic restricted from its normal flow or course. (Ord. 01-89 § 2, 2001.)