Residents Need to Make Tree Trimming a Priority. We have received numerous complaints about tree branches obstructing the public right-of-way on sidewalks and the sight lines to STOP signs and other important street signs. Please make sure your trees branches are trimmed to a minimum height of 8 feet over sidewalks and 13.5 feet over streets, especially at intersections where stop signs are concealed by low-hanging branches or overgrown bushes.