Fences, hedges, and walls that are higher than would otherwise be allowed, in instances where there is a legitimate need for a higher fence. In approving such fences, the director shall consider safety and sight distance requirements, in addition to aesthetics and input from affected adjoining property owners. Affected adjoining property owners shall be notified in writing at least ten days prior to the approval of any fence, hedge, or wall exceeding the height restrictions of the underlying zone.