The Director of Public Works shall not grant the permits required by this title under any circumstances or upon any condition when he finds that the granting of such permit will adversely interfere with or affect the necessary visibility from the street, necessary drainage in the immediate vicinity of the encroachment, present or contemplated vehicular and pedestrian traffic upon the street, or the maintenance of streets. (Ord. 1205 § 2, 1969; prior code § 27.1501).