Visibility at intersections. No object, including, without limitation, fences, hedges, trees and other plantings, buildings, structures, walls, signs and motor vehicles, exceeding a height of three feet as measured from the lowest elevation of the centerline of any abutting street shall be temporarily or permanently placed, erected, installed or parked within the clear sight triangle required at the intersection of two streets or the intersection of a nonresidential driveway with a public street. The required clear sight triangle is illustrated in Appendix A.