An unobstructed cone of vision shall be provided at exits from driveways so that pedestrians and other vehicular traffic can be properly seen. This cone shall be determined by a point eight feet behind any sidewalk or walk area or a point twenty feet from the edge of the through roadway, whichever provides the larger field of vision. Any landscaping, fencing or walls located closer than eight feet from the nearest sidewalk line or twenty feet from the nearest roadway edge shall not exceed twenty-four inches in height along any side having a driveway exit to a street. (Passed 10-26-10.)