The following requirements are applicable to all subdivisions within the city.
(A) The grades of any street or alley shall not be less than 0.4%. Where specifically approved by the City Engineer, alleys may be designed with a twenty-five-one-hundredths grade when constructed with concrete pavement.
(B) The grades in all streets, arterial highways, collector streets, minor streets and alleys in any subdivision shall not be greater than the maximum grades for each classification as follows:
Principal arterial highway | 6% |
Minor arterial highway | 6% |
Collector street | 6% |
Local street | 8% |
Alley | 8% |
Pedestrian way | 20% (may be increased if steps of an acceptable design are provided) |
(C) All changes in street grade of 1% or more shall be connected by vertical curves. The length of the vertical curve will be determined on the basis of providing stop sign distances for each road classification where design speed for arterial and collector streets is 40 mph and local streets is 25 mph. In no case shall the length required vertical curve be less than 15 times the algebraic difference in rate of grades for arterial and collector streets or one-half of this minimum for all other streets.
(D) The radius of curvature on the center line of the street shall not be less than that required to produce stop sign distance as defined in division (C) of this section. In no case, however, shall the radius or curvature for arterial and collector streets be less than 300 feet or for local streets, service drives and alleys be less than 100 feet.
(Ord. 232, passed 11-1-2000)