Overnight parking for storage on any paved street is hereby prohibited. "Overnight parking for storage" is hereby defined as the habitual parking or storing of cars, trucks, tractors or other vehicles on paved streets during the hours from sundown to sunup, except temporarily disabled vehicles which are protected by flares or other approved signal devices. It is not the intention of this section to prohibit or interfere with passenger cars temporarily parked at night, where such parking is not done regularly and during the entire night.