No hedge, tree, evergreen, shrub, bush, fence or other planting or structure shall be located on any corner lot in such manner as to cause danger to traffic on a public street, road or avenue by obstructing the vision of persons operating vehicles on said public ways; and all hedges, trees, evergreens, shrubs, bushes, fences or other plantings or structures which, on the effective date of this Part 3, are so located on corner lots as to cause said danger to traffic or which otherwise fail to comply with the site triangle requirements of Part 5, Subdivision of Land, shall be cut, trimmed, removed or altered, within five days after notice from the Zoning Administrative Officer, in such manner and to such extent that said danger to traffic shall be eliminated.