Visibility for traffic safety shall be provided,
by excavation if necessary, within the triangles formed by the outside
boundaries of intersecting right-of-way lines and a diagonal line
connecting points in each right-of-way line, said points being 60
feet from the intersection of the outside boundaries of right-of-way
lines. No obstacles, including but not limited to fences, walls, hedges
or other landscaping, shall be permitted to obstruct such visibility.