The City Manager, subject to any directions which the Council may give by motion or resolution, is hereby authorized:
   (A)   To designate and maintain by appropriate devices, marks or lines upon the surface of the roadway, crosswalks at intersections where, in his or her opinion, there is particular danger to pedestrians crossing the roadway, and at other places as he or she may deem necessary; and
   (B)   To establish safety zones or islands of a kind and character and at places as he or she may deem necessary for the protection of pedestrians.
(`90 Code, § 20-32)