(a) Paving Materials. Design and choice of paving materials used in pedestrian areas shall consider the following factors: cost, maintenance, use, characteristics of the users, appearance, availability, glare, heat, drainage, noise, compatibility with surroundings, decorative quality, and aesthetic appeal. Acceptable materials shall include, but are not limited to, concrete, brick, cement pavers, and asphalt.
(b) Walls and fences shall be erected where required for privacy, screening, separation, security, or to serve other necessary functions.
(1) Design and materials shall be functional, they shall complement the character of the size and type of building, and they shall be suited to the nature of the project.
(2) No fence or wall shall be, so constructed or installed so as to constitute a hazard to traffic or safety.