§ 152.56 CURVATURE OF STREETS.
   The minimum curvature of streets on the center line shall be:
   (A)   Major street - 600 feet.
   (B)   Secondary street - 300 feet.
   (C)   Minor street - 100 feet.
   (D)   Cul-de-sac - 100 feet.
('69 Code, App. B, § 6.17)