in lieu thereof. They are essential from the viewpoint of fire protection, police protection, emergency services (i.e. ambulance) and loading or unloading of goods, refuse collection, servicing of blocked sewers and utility services. Without such alleys, the above noted services would at least be more costly if not impossible to complete or adequately access; and would noticeably interfere with street traffic, thereby reducing the access capacity of the adjacent arterial, collector, or street for business.