Landscaping shall be arranged so as not to obscure traffic signs, fire hydrants, or obstruct drivers' sight distance within the parking area and at driveway entrances. A clear space of not less than five feet shall be provided in front of and completely around all fire hydrants, manholes, service boxes, and valve boxes. The clear space shall be free of all obstructions such as parked cars, landscaping at maturity, utilities, service vehicles, construction work, snow and similar items.