Except when necessary to avoid conflict with other traffic, or in compliance with the direction of a police officer or fire official or traffic-control sign, signal or device, no person shall stop, stand or park a vehicle, whether occupied or not, in a designated fire zone, except momentarily to pick up or discharge a passenger or passengers, or temporarily for the purpose of and while actually engaged in loading or unloading property. Vehicles parked in a fire zone are subject to immediate impoundment, in addition to other penalties. (Ord. 850 § 4, 1998).