A. At all street intersections in all districts, no obstructions to vision exceeding thirty (30) inches in height above curb level shall be erected or maintained on any lot within the triangle formed by the street lines of such lot and a line drawn between points along such street lines thirty (30) feet distant from their point of intersection.
B. At all intersections of driveways and public rights-of-way, no planting, fences or similar materials exceeding thirty (30) inches in height shall be permitted in the first twenty (20) feet from said right-of-way.