§ 11.04.120 GENERAL STREET DESIGN STANDARDS.
   A.   Street right-of-way and pavement width.
      1.   Unless otherwise indicated on the comprehensive plan or on a separately approved future street plan, the street right-of-way and roadway widths shall not be less than the minimum width in feet shown in the following table:
 
Type of Street
Right-of-Way Minimum (in feet)
Road Surface Minimum (in feet)
Boulevard
84
54
Avenue
70
44
Drive
60
42
Cul-de-sac
50
36
 
      2.   Where conditions, particularly topography or the size and shape of the tract, make it impractical to otherwise provide buildable sites, narrower rights-of-way may be accepted, ordinarily not less than 60 feet. If necessary, slope easements may be required.
   B.   Reserve strips. Reserve strips or street plugs controlling the access to streets will not be approved unless necessary for the protection of the public welfare or of substantial property rights, and in these cases they may be required. The control and disposal of land composing such strips shall be placed within the jurisdiction of the city under conditions approved by the Planning and Zoning Commission.
   C.   Street alignment. All streets shall, as far as practicable, be in alignment with existing streets by continuations of the centerlines thereof. In no case shall the staggering of streets make a "T" intersection (or) be so designed as to allow a dangerous condition. Offsets of less than 100 feet will not be allowed.
   D.   Future extension of streets. Where necessary to give access to or permit a satisfactory future subdivision of adjoining land, streets shall extend to the boundary of the subdivision; and the resulting dead-end streets may be approved without a turnaround. Reserve strips, including street plugs, may be required to preserve the objectives of street extensions.
   E.   Street intersection angles. Streets shall be laid out to intersect at angles as near to right angles as practical except where topography requires a lesser angle, but in no case shall the acute angle be less than 80 degrees unless there is a special intersection design. An arterial or collector street intersecting with another street shall have at least 100 feet of tangent adjacent to the intersection unless topography requires a lesser distance. Other streets, except alleys, shall have at least 50 feet of tangent adjacent to the intersection. Intersections which contain an acute angle of less than 80 degrees or which include an arterial street shall have a minimum corner radius sufficient to allow for a roadway edge radius of 20 feet and maintain a uniform width between the roadway and the right-of-way line. Ordinarily, the intersection of more than 2 streets at any one point will not be approved.
   F.   Cul-de-sacs. A cul-de-sac shall be as short as possible and shall in no event be more than 400 feet long. All cul-de-sacs shall terminate with a circular turnaround having a minimum right-of-way radius of 45 feet. The length of the cul-de-sac shall be measured along the centerline of the roadway from the near side of the intersecting street to the farthest point of the cul-de-sac.
   G.   Street names. No street name shall be used which will duplicate or be confused with the names of existing streets in the city, except for extensions of existing streets. Street names and numbers shall conform to the established pattern in the surrounding area.
   H.   Grades and curves. Grades shall not exceed 6% on arterials, 10% on collector streets, or 12% on other streets. Centerline radii of curves shall not be less than 300 feet on major arterials, 200 feet on minor arterials or 100 feet on other streets, and shall be to an even 10 feet. Where existing conditions, particularly the topography, make it otherwise impractical to provide buildable sites, steeper grades, and sharper curves may be approved by the Planning and Zoning Commission. In flat areas, allowance shall be made for finished street grades having a minimum slope, preferably of at least 0.5%.
   I.   Protection from major streets. Where a development abuts or contains Highway 95, an existing or proposed arterial, or a collector street, the development design shall provide adequate protection for residential properties and shall separate through and local traffic or, if separation is not feasible, shall minimize the traffic conflicts. The design requirements may include any of the following:
      1.   A parallel access stream;
      2.   Lots of suitable depth abutting the major street with frontage along another street;
      3.   Other treatment suitable to meet the objectives of this subsection.
   J.   Median islands. Median islands may be used on arterial or collector streets for the purpose of controlling access, providing turn refuges, or for aesthetic purposes.
   K.   Curbs. Curbs shall be installed on both sides of public streets and shall be at least 6 inches in height.
   L.   Transit facilities. New developments along existing or proposed transit routes may be required to provide areas and facilities for bus turnouts, shelters, and other transit-related facilities needed to serve the development.
   M.   Traffic controls. The Community Services Department may require that the owner complete a competent engineering traffic impact analysis to determine the number and types of traffic controls (traffic lights, signs, turn lanes) as may be necessary to accommodate anticipated traffic flow and that will be required by the city as a condition of issuance of a building permit. The analysis will be completed according to specifications established by the city. Review and approval of the analysis by the Community Services Director shall be required prior to issuance of a construction permit.
(Prior Code, § 14-1-7(D)) (Ord. 13-1096, § 6, passed 7-9-2013)