Sidewalks shall be required unless waived by the approving authority pursuant to subsection 25-9.7i. In weighing such waiver requests the approving authority shall analyze the probable volume of pedestrian traffic, the street classification in instances where streets are involved, school bus stops, the development’s location in relation to other populated areas, and the general type of improvement intended. Sidewalks shall be at least four feet wide and located a minimum of three feet back from the curb line. Sidewalks shall be at least four inches thick, except at points of vehicular crossing where they shall be at least six inches thick, of Class C concrete having a twenty-eight-day compressive strength of 4,000 p.s.i., and shall be airentrained. Such driveway areas shall be reinforced with a six by six 10/10 welded wire mesh.