(a) In a subdivision, alleys shall be provided in commercial and industrial districts, except that the city may waive this requirement where other definite and ensured provision is made for service access, such as offstreet loading, unloading and parking, consistent with and adequate for the uses proposed.

(b) The width of an alley shall not be less than 20 feet, and the alley shall be paved full width.

(c) alley intersections and sharp changes in alignment shall be avoided, but where necessary, corners shall be cut off sufficiently to permit safe vehicular movement for trucks.

(d) Dead-end alleys shall be avoided where possible, but if unavoidable shall be provided with adequate turnaround facilities at the dead-end, as determined by the city.