Sidewalks of a minimum width of five feet shall be provided for all roadway sections in the location shown by the typical cross sections. Sidewalks shall be constructed of concrete four inches thick with the thickness increased to six inches where the sidewalk is crossed by a driveway. In lieu of traditional sidewalk designs on both sides of a street, the Planning Commission may waive such requirement in favor of a single walkway that incorporates design considerations such as greater width, special pavers, bricks, or scored concrete to enhance pedestrian safety, functionality and attractiveness of the walkway.