31-22.2   Width.
   a.   Minimum Requirements. The minimum width of pavement and rights-of-way of the various classes of streets shall be as shown on the following table:
Width of Pavement
Class
Class
w/curbs
w/o curbs
Right-of-way
Width of Pavement
Class
Class
w/curbs
w/o curbs
Right-of-way
Thoroughfares and arterials
Two-lane
40 feet
60 feet
Four lane undivided
64 feet
64 feet
84 feet
Four-lane divided
80 feet
100 feet
Industrial two-lane
48 feet
68 feet
Industrial four-lane
64 feet
84 feet
Collector streets
36 feet
36 feet
56 feet
Minor streets
32 feet
36 feet
52 feet
Private roads
16 feet
25 feet
 
   b.   Measurement. The width of roadway shall be measured normal to the centerline between the top face of the curbs, or edges of the pavement, not including roadside ditches.
   c.   Exceptions. Exceptions to the widths set forth in paragraph a., because of terrain conditions in hillside areas, shall be considered on the basis of cross-sections and other evidence to be submitted by the subdivider.