Where necessary to give access to or permit a satisfactory future subdivision of adjoining land, streets shall extend to the boundary of the property and the resulting dead-end streets may be approved without a turnaround provided that control of access across such dead-end street shall be vested in the city. In all other cases a turnaround having a minimum radius of forty feet shall be required. (Ord. 89 § 5.2(c), 1955).