A. The width and alignment of all primary and secondary streets shall conform to the width and alignment of those streets already existing in the city adjacent to the subdivision, and to the requirements of the planning commission in conformity therewith or subsidiary thereto, and shall conform to any proceeding affecting the subdivision which may have been initiated by the planning commission, or approved by the planning commission upon initiation by other legally constituted bodies of the county or state, unless by action of the planning commission and such other bodies a different width and alignment shall be approved.
B. All streets, as far as practicable, shall be required to be in alignment with existing adjacent streets or their proper projection and in general conformity with the general street plan of the city; provided, however, in cases where the holdings are large enough, a modified curved street layout may be required or permitted in the event such a layout will not interfere with the general street plan and that all boundary connections are made satisfactorily.
C. A minimum width of sixty feet (60') between property lines shall be maintained on all streets, unless it can be definitely shown that topography or local conditions will not permit such a width or that a lesser width is more suitable.
D. The width of streets or roads on hillside or mountainous lands shall be determined by expected future traffic needs and topographical conditions, and the decision of the planning commission thereon, after an investigation and hearing, shall be conclusive. All mountainous highways which form a part of primary or secondary traffic routes shall have a minimum width of forty feet (40') between property lines but shall be made wider on curves where the topography will permit. Other mountainous roads of more than local importance shall have a minimum width of thirty feet (30') between property lines. Such widths shall be approved only when the planning commission, in the exercise of reasonable discretion, determines that the topography will not permit a greater width.
E. The rate of grades of all streets shall be kept as low as possible, bearing in mind the advantageous development of the subdivision and surrounding property. Streets of more than local importance shall not exceed a maximum grade of eight percent (8%), and no street shall be approved with a maximum grade in excess of twelve percent (12%), unless by special permission of the planning commission.
F. A minimum center line radius of fifty feet (50') shall be maintained on all winding mountainous streets, and a minimum of three hundred feet (300') shall be required on all through traffic streets. Existing streets of less than thirty feet (30') in width shall be widened to a thirty foot (30') width when the centerline radius is the minimum or near the minimum. Street intersections shall be as nearly at right angles as possible, and care shall be taken in laying out intersections that adequate, but not excessive, areas are offered for dedication. Grades of streets leading into through streets from above shall be reduced as much as practicable near the intersection.
G. At all block corners, rounding or cutting back at the property lines shall be required. The intersection corners on all primary and secondary streets shall be rounded by a curve having a radius of curvature at least twenty feet (20') on the property line. All other corners shall be rounded by curves having a radii of the curvature at least ten feet (10') on the property line. Where business development is anticipated, an optional method of a diagonal cutoff substantially equivalent may be used instead of rounding in order to simplify building construction.
H. Private streets, alleys, or ways shall not be approved, except when the planning commission, after an investigation and hearing, finds that public dedication is impractical. All alleys and private streets shall be paved and approved the same as public alleys or streets.
I. All street improvements in any subdivision shall be made in accordance with the standard specifications for such improvements on file in the office of the city engineer and in accordance with the requirements of the city engineer and planning commission. (1962 Code § 10-903; amd. Ord. 75-O-1561, eff. 3-4-1975)