1117.02 DIMENSIONAL STANDARDS.

   (a)    Typical Street Standards. The Planning Commission will determine the required minimum dimensional standards of all rights-of-way, pavements, sidewalks, and other public improvements but shall consider the advice and recommendations of the City Engineer in doing so. The typical street requirements shall be as follows:

      (1)    Major thoroughfare. 

         A.    The right-of-way width shall be as provided in these Subdivision Regulations. As the geometrical design, pavement and right-of- way widths may vary considerably over that of a typical minor street, the Planning Commission shall decide upon the pavement width and the portion of the major street construction that shall be done by the developer. In doing so, the Planning Commission shall take into account the location, extent and character of the proposed development; the probable number of anticipated employees; the degree to which the proposed lots or land use is to be serviced from or otherwise has access on the major streets; and the extent of vehicular traffic that may be generated upon such major thoroughfare or thoroughfares. The Planning Commission, in determining the amount of participation that shall be made by the subdivider shall also take into account the cost and participation involved in the trunk sewers and possible extra cost in length of service connections, driveway aprons, etc.

         B.    One hundred-foot right-of-way; thirty-seven foot pavement including curb and gutter; five foot sidewalks at property line.

      (2)    Collector streets within residential development. Sixty foot right-of-way including deadend segments; twenty-seven foot pavement, including curb and gutter; five foot sidewalks at property line. The Planning Commission may authorize the extension of already established or dedicated streets having a fifty foot right-of-way width.

      (3)    Minor streets. Fifty foot right-of-way; twenty-seven foot pavement including curb and gutter; four foot sidewalks at property line.

         (Ord. 46-1962. Passed 8-17-62. )

      (4)    Cul-de-sac streets. 

         A.    Serving Business or Industrial Developments. A sixty foot right of way; twenty-seven foot pavement including curb and gutter. The permanently closed end shall be provided with a turnaround having an outside roadway radius of fifty feet, and a street property line radius of at least sixty feet.

         B.    Serving Residential Developments. A fifty foot right of way; twenty-seven foot pavement including curb and gutter; four foot sidewalks at the property line. The permanently closed end may be required with a turnaround having an inside roadway radius of twenty-one feet, and shall have an outside roadway radius of forty-three feet, and a street property line radius of fifty-five feet. (Ord. 3-1990. Passed 1-11-90.)

      (5)    Marginal collector streets abutting a major thoroughfare. Forty foot right-of-way; twenty foot pavement with curb and gutter on development side; one five foot sidewalk.

      (6)    Alleys. Twenty-four foot right-of-way; twenty foot pavement with four foot space for utilities.

      (7)    Crosswalks. Twenty-five foot right-of-way; at least five foot paved walkway along centerline.

      (8)    Easements. Easements across lots or centered on rear or side lot lines shall be provided for utilities where necessary and shall be at least ten feet wide. Easements shall also be provided for water courses, channels, or streams and shall be adequate for the purpose.

   (b)    Grades. Minimum grades on any street shall be one-half of one percent (.5%) at gutters for purposes of drainage and not more than six percent (6%) for major thoroughfares nor eight percent (8%) for minor streets where feasible. Streets shorter than 600 feet shall be not more than twelve percent (12%).

   (c)    Street Alignment. 

      (1)    Vertical. The profile grades for major streets shall be connected by vertical curves of a minimum length equivalent to at least forty times the algebraic difference between the rates of grade, expressed in feet per hundred for secondary and minor streets, at least twenty times.

      (2)    Minimum horizontal-radii of center line curvature. 

         Street          Degrees       Feet

          Major          12          475

         Secondary       19          300

          Minor          28          200

          Cul-de-sac       58          100

         A tangent at least 100 feet long shall be introduced between reverse curves on major or collector streets and at least fifty feet on minor streets.

      (3)    Visibility. Minimum vertical visibility, measured four and one-half feet eye level to eighteen inches tail light, shall be:

         A.    500 feet on main thoroughfares;

         B.    300 feet on secondary thoroughfares;

         C.    200 feet on minor streets; and

         D.    100 feet on streets shorter than 600 feet.

         Minimum horizontal visibility shall be:

         A.    300 feet on main thoroughfares;

         B.    200 feet on secondary thoroughfares; and

         C.    100 feet on all other streets, as measured on such center lines.

   (d)    Intersections. Property lines at street intersections shall be rounded with a radius of at least thirteen feet and curbs or edges of street pavements shall be rounded by radii of at least twenty-five feet for residential, and fifty-two feet for industrial or major street intersections. (Ord. 46-1962. Passed 8-17-62.)