Resolutions-1997-021

B. When two streets intersect, the grade of the lower classification street shall be minimized to allow safe stopping and starting in adverse weather. C. The minimum grade for street shall be 0.5%, except around the bulbs of cul-de-sacs where the minimum grade shall be 0.7%. 5.11 CURVE RADIUS A. The minimum center line radius for curves shall be as follows: <table> <tr><th>Arterial</th><td>1,000 feet</td></tr> <tr><th>Collector</th><td>350 feet</td></tr> <tr><th>Local</th><td>150 feet</td></tr> <tr><th>Industrial</th><td>150 feet</td></tr> </table> B. Under no circumstances will variances be granted for radii less than 75 feet. 5.12 PAVEMENT CROSS SECTION A. All pavements shall have a 2% parabolic crown cross-section as shown in Figure 5.1 or 5.1.A. 5.13 CURB AND GUTTER SECTION A. For P.C.C. pavement, curbs may be Integral 6 inch Sloped Curbs or Integral 6 inch Standard Curb as shown in Figure 5.3, and as approved by the City Engineer. B. For P.C.C. pavement, curbs shall be Integral cast Portland cement concrete. There shall be no separation between the curb and gutter section and the pavement. C. For A.C.C. pavement, curbs may be 6 inch Standard Curb unit or 6 inch Sloped Curb unit as shown in Figure 5.4, and as approved by the City Engineer. 5.14 INTERSECTION CORNER RADIUS A. The corner radius at intersections will depend on the functional classification of the intersecting streets. These are the minimum criteria: <table> <tr><th>Arterial – arterial</th><td>50 feet</td></tr> <tr><th>Arterial – collector</th><td>30 feet</td></tr> <tr><th>Arterial – local</th><td>30 feet</td></tr> <tr><th>Collector – collector</th><td>30 feet</td></tr> <tr><th>Collector – local</th><td>30 feet</td></tr> <tr><th>Local – local</th><td>30 feet</td></tr> <tr><th>Industrial uses</th><td>75 feet or as per IDOT WB-50 requirements</td></tr> <tr><th>Alley – all</th><td>Maximum allowable that will remain in the street R.O.W. (not more than 30 feet)</td></tr> </table> Corner radii shall be enlarged on routes that will have significant truck or bus traffic.