The following requirements are applicable to all subdivisions within the jurisdiction of the commission:
(A) The grades of any street or alley shall not be less than five-tenths percent (0.5%).
(B) Arterial, collector or secondary highways as designated by the thoroughfare plan shall be limited to a maximum grade of five percent (5%).
(C) Local streets shall be limited to a maximum grade of ten percent (10%).
(D) Alleys shall be limited to a maximum grade of ten percent (10%) where they are primarily for residential service, but shall be limited to a maximum of eight percent (8%) when used to provide service to commercial property.
(E) Pedestrianways or crosswalks shall be limited to a maximum grade of fifteen percent (15%) unless steps of an acceptable design are to be constructed.
(F) All changes in street grade of one percent (1%) or more shall be connected by vertical curves. The length of the vertical curve will be determined on the basis of providing stopping sight distances for each road classification where design speed for arterial and collector streets is forty (40) miles per hour and local streets is twenty five (25) miles per hour. In no case shall the length of the required vertical curb be less than fifteen (15) times the algebraic difference in rate of grades for arterial and collector streets or one-half (1/2) this minimum for all other streets.
(G) The radii of curvature on the centerline of the street shall not be less than that required to produce stopping sight distance, as defined in subsection (F) of this section. In no case, however, shall the radii of curvature for arterials, collectors and secondary streets be less than three hundred feet (300') or for local streets, service drives and alleys be less than fifty feet (50'). (Ord. 365, 11-3-1970; amd. 1979 Code)