12.30.050 – Standards for street design

  1. General Requirements
    1. All streets shall be properly integrated with the existing and proposed systems of thoroughfares and dedicated right-of-way as established on a City designated official map and/or a City adopted Comprehensive Plan.
    2. Rights-of-way and all road geometry shall be designed in accordance with the designations found in the Comprehensive Plan and shall conform to the dimensions as stated in the Engineering Design and Inspection Policy Manual.
    3. No half width street improvements shall be permitted.
    4.  New streets shall not use the name of any street already used in the City or its environs, unless the street is an extension of an already named street or part of a through street.
    5.  All through streets shall be extended to the boundaries of the subdivision.
    6.  All street widths are measured from back to back of curbs, except Residential Estate area roadways, which are measured from edge to edge of driving surface.
    7. Street signs shall be installed by the developer in accordance with current City standards.  Should the City need to install any signs the developer shall be required to pay for the costs, including labor and materials, for these sign installations.
      (Ord. 2012-M-45 § 3.)
  2. Layout and Design
    1. All streets shall be properly related to special traffic generators such as industries, business districts, schools, churches, and shopping centers; to population densities; and to the pattern of existing and proposed land uses.
    2. Minor or local streets shall be laid out to conform as much as possible to the topography, to discourage use by through traffic, to permit efficient drainage and utility systems, and to require the minimum number of streets necessary to provide convenient and safe access to property.
    3. Intersections
      1. The intersection of two streets shall form a 90 degree angle where the centerlines cross along tangent sections for each street. Where one of the street alignments is a horizontal curve, the tangent of the second street shall pass through the curve center of the intersecting street. At no time shall two curved streets intersect.  See Table I in the Engineering Design and Inspection Manual for all Right-of-way width and pavement dimension requirements.
      2. Street intersections shall be designed to encourage safe and efficient traffic flow.  The intersection of more than two streets shall be avoided. Should specific conditions of design indicate that the intersection of more than two streets is necessary; the developer shall obtain approval from the Director of Public Works prior to proceeding with Final Engineering Plans.
    4. Culs-De-Sac 
      1. No cul-de-sac street shall be more than five hundred feet (500’) in length measured along its centerline from the street of origin to the end of its right-of-way, unless there are less than sixteen lots abutting the cul-de-sac street
      2. Each cul-de-sac shall have a terminus of nearly circular shape with a minimum diameter of one hundred twenty feet (120’).
    5. For temporary dead-end streets, a temporary T-shaped or circular turnaround is required at the street end. If no curb cuts for driveway access or other access are intended and if in accordance with generally accepted engineering principles no safety or maintenance problems are apparent as determined by the Director of Public Works, the director may waive the turnaround requirement. The turnaround surface shall be constructed of asphalt or concrete materials.
    6. Combination concrete curb and gutter shall be constructed as part of the pavement, except for streets in areas zoned “Residential Estate” per Title 17, “Zoning.”  Roadways in areas zoned "Residential Estate" may be constructed without combination curb and gutter provided the flow velocity of water in the ditches will not exceed four feet per second.
(2012-M-45: § 3; 2003-M-98 : § 1; 1998-M-39 ; 1998-M-23 : § 1; 1989-M-55 : § 1)