In addition to relating streets to topography, as provided in division (A) hereof, streets shall be designed according to the function served, the use of abutting land and standards of width, intersections, maximum grades and curvatures, as set forth in this section.
(A) Major Streets.
(1) These streets function primarily for the movement of fast traffic between points of heavy traffic generation. Unless shown otherwise on the Thoroughfare Plan, they shall be planned for continuation of existing streets in the system at the same or greater width in accordance with adopted city standards. Major streets shall contain as few intersections as possible.
(2) Where a subdivision of one-family dwellings adjoins a major street, the Commission shall require the developer to prepare sketches and estimates of a plan based on marginal access streets, or some other treatment, such as the fronting of lots on perpendicular local streets, in order to protect the residential property from the movement of heavy traffic and to eliminate driveways cutting into a major street, and it may require a plan wherein lots do not have direct access onto the major street or it may require a setback of such depth that marginal streets can be constructed in the future.
(B) Secondary Streets. These streets function to collect traffic from local streets and to distribute it onto major streets. As such they will normally contain a relatively large number of intersections with local streets and few intersections with main streets. Unless shown otherwise on the Thoroughfare Plan, a secondary street system may be required wherever a residential neighborhood surrounded by major streets is over 150 acres in area or where the local street pattern is so designed as to converge and serve over 500 one-family dwellings, and for any multi-family development. Secondary streets shall be planned for continuity and to lead more or less directly to one or more focal points or centers of traffic generation and may become bus routes.
(C) Local Streets.
(1) These streets provide direct and full access to each lot. They shall be planned for convenient circulation toward the principal directions of travel, bus routes, schools and playgrounds. The layout shall be related to the topography and natural features. The street pattern shall be indirect and yet continuous to prevent through traffic, formed of straight, moderately winding, curved, loop, angular or ell streets. Tee-intersections shall predominate; cross-intersections shall be avoided. There shall be an underlying systematic neighborhood pattern. However, gridiron and other rigid geometrical patterns shall be avoided. The street pattern shall include extensions to the boundaries of the development to provide circulation between adjoining neighborhoods. Private street(s) are prohibited.
(2) Cul-de-sac or permanent dead-end streets are prohibited. All new streets must have two methods of ingress and egress on secondary or major streets.
(D) Extension of Streets. Where a subdivision adjoins unsubdivided land, certain streets shall be planned to extend to the boundary lines so that all parcels may be subdivided and a coordinated street system obtained. A temporary turnaround, or back-around, shall be provided for each such street extension if it is more than 200 feet in length and if lots front thereon. Provisions shall be made for future extension of the street and utilities and so noted on the final plat.
(E) Nonconforming Widths. Where property abuts a street which does not conform to the width required by thoroughfare plans of the city, county or State Transportation Department or these regulations, the additional width shall be dedicated when such land is subdivided. Streets of less than the required width shall not be permitted except where the Commission finds that such a street will be adequate to serve the partial development until all abutting property is subdivided.
(F) Reserve Strips Adjoining Streets. These strips, or other provisions to control access or extensions to pavement and/or utilities to a nearby property, shall not be permitted except where the control and disposal of land comprising such strips has been assigned to the city under conditions approved by the Commission.
(G) Streets for Multi-Family Developments. These streets shall be planned to connect with major or secondary streets so as not to generate large volumes of traffic on local residential streets. Vehicular and pedestrian access shall be planned so that a street, service drive parking area or delivery area will be located not more than 100 feet from every main or service entrance of a building and available for each dwelling unit. All other applicable planning principles shall apply to the design of multi-family developments. Private street(s) are prohibited.
(H) Streets for Business and Industrial Developments. These streets shall be planned to connect with major streets so as not to generate traffic on local residential streets. The intersection of service streets, or access driveways to parking areas, with major streets, shall be located so as to cause the least possible interference with the movement of traffic on the major streets. Access driveways (measured on the centerline) shall be located not less than 50 feet from the right-of-way line of the nearest intersecting street and spaced at not less than 130-feet intervals. Parking areas serving adjoining business establishments shall be interconnected by drives. The Commission may require the dedication and improvement of marginal service roads along major streets abutting such developments.
(I) Intersections. Streets shall be designed to intersect as nearly at 90 degrees as possible and no street shall intersect another at less than 60 degrees. The intersection of more than two streets at a point or with centerline offsets of less than 125 feet is not permitted. Property lines at street intersections shall be rounded with a radius of not less than 30 feet for major streets and 20 feet for secondary and local streets.
(J) Right-of-Way Widths.
(1) Local Streets. Right-of-way widths shall be not less than:
(a) Non-through streets of less than 1,500 feet in length, 60 feet;
(b) Through streets or non-through streets longer than 1,500 feet, and where extra width is necessary for grading or placement of utilities, 60 feet;
(c) Cul-de-sacs of less than 1,000 feet in length, 60 feet;
(d) Turn-arounds, 80 feet pavement diameter and 120 feet property line diameter; “T” or “Y” turn-arounds may be approved by the Commission in unusual locations; and
(e) Marginal access streets, 40 feet.
(2) Multi-Family, Business and Industrial Streets. The right-of-way shall be determined for each development. Each street shall be of sufficient width to safely accommodate the maximum traffic, parking and loading needs and access for fire protection equipment.
(3) Secondary Streets. The right-of-way shall be in accord with the thoroughfare plans and standards and may vary from 60 to 80 feet.
(4) Major Streets. The right-of-way shall be in accord with State Transportation Department, county or city thoroughfare plans and standards and may vary from 80 to 120 feet.
(K) Grades of Streets (Vertical Alignment). The street grade shall not exceed 10% for local streets, 7% for secondary streets and 6% for major streets. Street grades shall be not less than 0.5% in order to provide adequate surface drainage.
(L) Curvature of Streets (Horizontal Alignment). Angles in the alignment of street lines shall be connected by a curve with a radius on the centerline of not less than 200 feet for local streets, 300 feet for secondary streets and 500 feet for major streets. Between reverse curves there shall be a tangent at least 1,000 feet long on major and secondary streets and 50 feet long on local streets.
(M) Street Names. A street name shall be selected which will not duplicate or be confused with the names of existing streets in the county irrespective of modifying terms such as street, avenue, boulevard, and the like. Streets that are or will eventually be continuations of existing or platted streets shall be named the same. Street names shall be subject to the approval of the Commission.
(N) Cul-de-sacs.
(1) All cul-de-sacs, as defined in § 1240.04, whether public or private, shall have a diameter of not less than 110 feet out to out (Refer to AAppendix IV) and must be fully paved.
(2) The developer shall be responsible for establishing varying building setbacks at cul-de-sacs and presenting the same for approval by the Planning Commission and Council.
(3) Cul-de-sac specifications shall be in conformity with the provisions of this division (N). See Appendix IV following the text of these subdivision regulations.
(Ord. 16-63, passed 5-20-1963; Ord. 64-96, passed 6-3-1996; Ord. 220-98, passed 3-15-1999; Ord. 11-16, passed 3-7-2016; Ord. 05-2021, passed 2-1-2021; Ord. 49-2021, passed 10-4-2021)