(a) Design. All streets and alleys shall be designed in accordance with modern engineering practices and shall conform with the requirements set forth in this chapter.
(b) Width. Streets shall be designed according to the widths specified on the approved preliminary or proposed plat, if applicable. Pavement widths shall be measured from the back of the curb on one side of the street to the back of the curb on the opposite side of the street.
(c) Sight Distance. The nonpassing sight distance over a crest shall be a minimum of 200 feet viewed from a point four feet six inches high.
(d) Grades.
(1) Maximum grade. The maximum grade shall not exceed six percent or a rise or fall of six feet in 100 feet.
(2) Minimum grade. The minimum grade shall be at least 0.40% or a rise or fall of 0.4 feet in 100 feet.
(e) Angle of Intersections. All streets intersecting new or existing streets shall do so at right angles with a minimum straight-away of 120 feet measured from the centerline of the intersected street.
(f) Horizontal Curves. All horizontal curves on streets shall have a minimum radius of 180 feet as measured from the centerline for all pavement types except pavement types A, B and C which shall have a minimum radius of 250 feet.
(g) Radius of Curb Returns.
(1) The minimum radius of curb returns for alleys and for streets thirty feet wide shall be thirty feet measured from the back of the curb.
(2) The minimum radius of curb returns for streets thirty-three feet wide or wider shall be forty feet except in special cases where a larger radius may be required.
(3) Where streets of different widths intersect, the radius of curb returns for the wider street shall prevail.
(h) Street Jogs. Street jogs with centerline offsets of less than 125 feet are prohibited.
(i) Changes in Grade. All changes in grade shall be accomplished by means of a parabolic curve.
(j) Other Standards; Construction Details. Items not specifically covered in this section shall be in conformity with the County Road Commission specifications. Each stage of construction shall be approved by the City Manager before proceeding to the next stage. Construction details shall be as shown in drawings on file with the City Manager.