(A)   Grades. The grades of streets shall be not less than ½ of 1% and shall not exceed the following:
      (1)   Primary arterial streets designated on the thoroughfare plan, 4%.
      (2)   Secondary arterial streets, 6%.
      (3)   Minor streets and alleys, 12%.
      (4)   Pedestrian ways or crosswalks, 15%, unless steps of an acceptable design are to be constructed.
   (B)   Curvature - Changes in grade. All changes in street grades above 1% shall be connected by vertical curves of a minimum length equal to 25 times the algebraic difference in the rate of grade for arterial streets, and one-half of this minimum for all other streets.
   (C)   Curvature - Radii. The radii of curvature on the center line shall not be less than the following:
      (1)   Arterial streets, 500 feet.
      (2)   Minor streets, 100 feet.
('74 Code, § 14-16) (Ord. passed 11-25-67) Penalty, see § 10.99