Whenever any sweet intersects an arterial street or state highway; the property lines at such intersection shall be rounded with a curve having a radius of not less than thirty feet. On all other sweet intersections; the property line at each block corner shall be rounded with a curve having a radius of not less than twenty feet. In either case; a greater curve radius may be required if streets intersect at other than right angles. (Ord. 1046 NCS §1 (part), 1972; prior code §22.7.505.2.)