Article 11 — Subdivisions and Land Development, Chapter 11-8 — DESIGN REQUIREMENTS FOR STREETS

Plans All streets and other features of the adopted comprehensive plan shall be platted by the subdivider or installed by the land developer in the location and if any, to the dimensions indicated on the major thoroughfare plan or transportation element of the comprehensive plan adopted by the governing body, as well as the transportation plan of the metropolitan planning organization (MPO).

The Director of Community and Economic Development may waive this requirement in instances where in his or her opinion such continuation or extension would be undesirable or incompatible with surroundings.

Where land proposed to be subdivided or developed includes only part of the tract owned by the subdivider or land developer, a tentative plan of a future street system for the portion not slated for immediate subdivision or land development consideration shall be required by the Director of Community and Economic Development. When such tentative plan is required, it shall be prepared and submitted by the subdivider or land developer at the time of submission of an application for preliminary plat, if required, or land development plan permit.

Highway Where a subdivision or land development abuts or contains an arterial street or a limited access highway, the Director of Community and Economic Development may require a street to be constructed approximately parallel to and on each side of such right-of-way, from which the lots or land development shall be accessed instead of the arterial street or limited access highway. In such cases, the Director of Community and Economic Development shall require a no-access easement at least 10 feet in width and planted with landscaping to prohibit travel across it.

Subdivision streets that intersect an arterial street shall do so at intervals of not less than 800 feet, or as required by the state department of transportation, whichever is greater.

Street names shall be reviewed for correct usage and reasonable meanings consistent with the language used and are subject to the approval of the Director of Community and Economic Development or designee. For instance, the term "parkway" shall not be appropriate for an undivided, two-lane road. Streets that are a continuation of or in alignment with existing named streets shall be given the name of the existing street. Names of new streets shall not duplicate or closely approximate those of existing streets in the city or county, regardless of the use of any suffix such as "street," "avenue," "boulevard," "drive," "place," "way," "court," or other designation.

Streets shall be aligned to join with planned or existing streets. Streets shall be laid out so as to intersect as nearly as possible at right angles (90 degrees), but in no case shall such a street intersection be less than 80 degrees. Where street offsets or jogs cannot be avoided, offset "T"

intersections shall be separated by a minimum centerline offset of 200 feet.

All state or U.S. numbered highways shall meet all design requirements of and be approved by the state department of transportation. The right-of-way width shall be the distance across a street from lot line to lot line. Minimum right-of-way widths shall be as required in Table 11-1:

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A five-foot wide perpetual easement shall be provided outside of the right-of-way line along both sides of all collector and local streets. See Figure 11-1: Typical Street Section A.

Street pavement widths, as measured from back-of-curb to back-of-curb, shall be provided as required in Table 11-1: Street Improvement Requirements. All roadways shall be constructed according to methods as contained in the most recent version of the state department of transportation Standard Specifications for Roadway Construction, unless otherwise approved by the Director of Public Works.

Maximum and minimum street grades shall be as specified in Table 11-1: Street Improvement Requirements. In addition, the grade across a cul-de-sac in all directions may not exceed 5%.

All changes in grade shall be connected by a vertical curve so constructed as to afford a minimum sight distance, said sight distance being measured from the driver's eyes, which are assumed to be 45 inches above the pavement surface, to an object 6 inches high on the pavement.

The minimum sight distance shall be as specified in Table 11-1: Street Improvement Requirements.

Where a deflection angle of more than 10 degrees in the alignment of a street occurs, the radius of curvature of the center line of said street shall be not less than specified in Table 11-1: Street Improvement Requirements. Tangents shall be as specified in Table 11-1: Street Improvement Requirements.

Curb lines at street intersections shall have a radius of curvature of not less 25 feet. Intersecting street right-of-way lines shall be rounded with a radius of no less than 25 feet.

Horizontal curves and superelevation shall be designed in accordance with the requirements specified in Table 11-1: Street Improvement Requirements.

Where an alley has been specifically authorized by the Director of Public Works, it shall comply with the standards specified in Table 11-1: Street Improvement Requirements. In addition, dead-end alleys shall be provided with a turn-around having a radius of at least 40 feet.

Street base material shall conform to the requirements of Table 11-1: Street Improvement Requirements.

Soil cement base shall contain a minimum 10% Portland cement by volume. All soil cement mix design must be reviewed and approved by the Department of Public Works. Soil cement base may be allowed only under the following conditions:

Street Improvement Requirements. If two-stage paving is approved by the Director of Public Works, the developer shall place a binder course on the street and delay final paving until the end of the one-year maintenance period.

It is the responsibility of the developer to ensure that all required tests are made and reported to the Public Works Department. The cost of all testing and quality control shall be performed at the expense of the developer by qualified testing laboratories.

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All streets shall be provided with a combination curb and gutter, unless stormwater is directed to a stormwater best management practice via a curb cut or other means, and approval has been given by the Department of Water Resources. Curb and gutter shall be constructed of 3,000 psi Portland cement concrete, or with a header curb of the same material at median or cul-de-sac islands. Curbing along streets shall meet one of the following standards: Along the outer edge of all roadways, 6 by 24-inch combination (full face) curb:

For use along medians only, six-inch header curb.

Turning lanes may be required at all entrances to subdivisions and industrial and commercial developments that front on arterial and collector streets. Turning lanes shall be 12 feet in width plus curb and gutter for a minimum distance of 200 feet measured from the intersection of the right-of-way lines.

Street name signs of a type approved by the city shall appear at all intersections. Traffic control signs shall be placed by the city and conform to the U.S. Manual on Uniform Traffic Control Devices, latest edition.

Pavement cuts across local streets shall conform to the following:

Utility crossings shall be bored across any arterial, subject to the approval of the state DOT, and across any collector unless a pavement cut is approved by the Director of Public Works.

lighting shall not be required to be closer than 200 feet, nor fixtures for all other roadways be closer than 100-foot spacing. If pole top fixtures are used, spacing should range between 125 feet to 150 feet.

Fixtures and standards/poles installed or used shall be approved by the utility company which will be responsible for the maintenance of the facilities in the city.

The fixtures shall be mounted a minimum of 13 to 16 feet above the ground, and shall have appropriate design to place the majority of the light output over the street. One light shall be located in each cul-de-sac within the subdivision, as well as at each intersection.

When street trees are provided, the subdivider or developer shall install said street trees, according to a plan approved by the Director of Public Works as a part of preliminary plat approval or land development permit approval, and prior to dedication or opening of said street. The Director of Public Works may accept an agreement by the subdivider where the responsibility for street tree planting is shifted to the owners or individual builders of the lots to be subdivided, upon their development. Any such responsibility shall be legally transferred in a form acceptable to the city attorney.

they are recommendations only and are subject to the approval of the Director of Community and Economic Development.