1161.12  VISIBILITY OF CORNER LOTS.
   No obstruction to view more than two (2) feet in height shall be placed on any corner lot within a triangular area formed by the street right of way lines and a line connecting them at points thirty (30) feet from the intersection of the street lines, except that street trees are permitted which are pruned at least eight (8) feet above the established grade of the roadway so as not to obstruct or hinder a motorist's line of sight.