(a) Major streets. The proposed subdivision shall conform to the various elements of the zoning ordinance and the comprehensive development plan and shall be considered in relation to existing and planned major thoroughfares and secondary thoroughfares; and such streets shall be platted in the location and the width indicated on such plan.
(b) Minor streets. The proposed subdivision street layout shall include minor streets so laid out that their use by through traffic shall be discouraged. The street layout shall provide for a continuation of streets adjoining subdivisions or for the proper projections of streets into adjoining property which may be subject to future subdivision.
(c) Streets in relation to other right-of-way. Should a proposed subdivision border on or contain an expressway or other limited access highway right-of-way, the city council may require the location of a street approximately parallel to and on each side of the right-of-way at a distance suitable for the development of an appropriate use of intervening land as for residential parks in residence districts, or for commercial, industrial or public purposes in appropriate districts. Such distance shall be determined with due consideration of the minimum distance required for approach grades and future grade separation.
(d) Marginal-access streets. Should a proposed subdivision border on or contain an existing or proposed major thoroughfare, the city council may require marginal-access streets, reverse frontages with approved screen planting contained in a nonaccess reservation along real property line having a minimum width of 15 feet, or such other treatment as may be necessary for adequate protection of residential properties and to afford separation and reduction of traffic hazards.
(e) Reserve strips. Reserve strips controlling access to streets shall be prohibited.
(f) Street rights-of-way widths. Street rights-of-way widths shall conform to at least the following minimum standards:
Street Type Right-of-Way Width (feet)
(1) Major thoroughfare 120
(2) Secondary street 86
(3) Minor street 66
(4) Marginal-access street 66
(5) Cul-de-sac street (terminated
with a 150-foot diameter turnaround) 66
with a 150-foot diameter turnaround) 66
(6) Loop street (terminated with a
50-foot diameter turnaround) 110
50-foot diameter turnaround) 110
(7) Turnaround or eyebrow 150
(g) Half streets. Half streets shall be prohibited, except where absolutely essential to the reasonable development of the subdivision in conformity with the other requirements of this article and where the city council finds it will be practicable to require the dedication of the other half when the adjoining property is developed. Wherever there exists adjacent to the tract to be subdivided a dedication or platted and recorded half street, the other half will be platted.
(h) Alleys. Alleys shall be prohibited.
(i) Street grades. For adequate drainage, the minimum street grade of all streets shall be no less than one-half of one percent and not greater than five percent. The planning commission may approve an alteration of this standard subject to the recommendation of the city engineer clearly indicating the purpose for requiring the alteration.
(j) Horizontal street curves. The radii of the minimum horizontal centerline curvature for major, secondary, and minor thoroughfares shall be as follows:
Street | Curvature | |
(1) | Major thoroughfare.... | 750-foot radius |
(2) | Secondary street.... | 400-foot radius |
(3) | Minor street.... | 200-foot radius |
(k) Horizontal street visibility. The minimum horizontal visibility for curves and intersections (measured on centerline) shall be:
(1) On major thoroughfares, 500 feet.
(2) On secondary streets, 300 feet.
(3) On minor streets, 300 feet.
(l) Vertical street visibility. Major, secondary and minor thoroughfares shall have profile grade change, where the grade change is over two percent, connected by vertical curves of a minimum length equivalent to the following algebraic differences:
(1) Major thoroughfare, 800 feet.
(2) Secondary street, 500 feet.
(3) Minor street, 300 feet.
Distances required shall be measured between points five feet above the centerline of the street.
(m) Street intersections. Streets shall be laid out so as to intersect as nearly as possible to 90 degrees. Curved streets intersecting with major thoroughfares and secondary streets shall do so with a tangent section of centerline 50 feet in length, measured from the right-of-way line of the major or secondary thoroughfare.
(Ord. No. 73, § 17(1), 3-4-1968)