(A) The minimum vertical grade for all streets shall not be less than 0.50%.
(B) (1) The maximum vertical grade for arterial streets shall not exceed 6%, for collector streets shall not exceed 6% and for other local streets shall not exceed 7.5%. The maximum grade for cul-de-sacs within the turning area shall not exceed 3%.
(2) Within the first 25 feet off the outer edge of the pavement of a street or railway intersection, the pavement will be designed on a 2% downward grade corrected by a 50 foot vertical curve to a maximum grade which shall be 50% of the maximum grade specification when within 200 feet of the outer edge of the intersection.
(C) The pavement crown for all streets shall be computed at a minimum rate of on 1/4 inch per foot.
(D) Clear visibility, measured along the centerline of the street on a plane of 4 feet above the street grade shall be provided for at least 500 feet on all arterial streets, 300 feet on collector streets and at least 150 feet on all other local streets.
(E) The maximum length of a cul-de-sac street shall be 800 feet measured along the street centerline from the intersection at origin through the center of the circular turnaround to the end of the right-of-way.
(F) To insure adequate sight distances when the street centerline deflects more than 10 degrees, connections shall be made by horizontal curves. The minimum centerline radius shall be 300 feet for local streets, 300 feet for collector streets and 500 feet for arterial streets.
(G) A tangent of at least 50 feet shall be introduced between reverse curves on local streets, at least 100 feet on collector streets and at least 500 feet for arterial streets.
(Prior Code, § 155.34)