(a) At street and alley intersections, property line corners shall be rounded by an arc, the minimum radius of which shall be ten and five feet, respectively. In business districts, a chord may be substituted for such arc.
(b) Street curb intersections may be rounded by radii of at least twenty feet.
(c) The above minimum radii shall be increased when the smallest angle of intersection is less than sixty degrees.
(11-4-85, appx.II.)