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DESIGN PRINCIPLES AND STANDARDS
The following principles and standards shall be construed as design objectives which may be reasonably modified for reasons of practical difficulty or site characteristics subject to the approval of the municipality.
(A) Every subdivision’s plat shall conform to the requirements and objectives of these design principles and standards and the Master Plan, or any parts thereof, as may be adopted by the Planning Commission and/or Zoning Commission, as required, to Ch. 157, other municipal ordinances, and to the public acts of the state.
(B) Whenever a tract to be subdivided embraces any part of a street designated on the Master Plan, as may be adopted, such street shall be platted in the location and width indicated on such plan.
(1984 Code, § 6-02-04-010) (Ord. 11, passed 8-26-1969)
(A) Street layout shall provide for the continuation of existing major or collector streets in surrounding areas, or conform to a plan for neighborhood development approved by the Planning Commission and/or Zoning Commission, as required.
(B) Certain proposed streets, as designated by the Planning Commission and/or Zoning Commission, as required, shall be extended to the boundary line of the tract to provide for future connections with adjoining unplatted land. In general, these extensions shall be not more than 1,300 feet apart.
(C) Where a subdivision abuts any of the following rights-of-way or zone districts, the Planning Commission and/or Zoning Commission, as required, shall normally require location of a street approximately parallel to, and one lot depth distant from, such rights-of-way or zones:
(1) Any street the Planning Commission and/or Zoning Commission, as required, may designate as a major traffic artery;
(2) Railroad and major overhead utility transmission lines; and
(3) Commercial or industrial districts.
(D) Proposed streets shall be so arranged in relation to existing topography as to produce desirable lots and streets of reasonable gradient.
(E) Except where justified in unique conditions, alleys will not be approved in those parts of the plat proposed for one- or two-family residential use.
(F) Street jogs with centerline offsets of less than 125 feet shall be avoided.
(G) Half-streets are prohibited, except where absolutely essential to the reasonable development of the tract in conformity to principles herein stated. Whenever a half-street has previously been platted outside of and abutting the tract boundary line, the remaining half shall be platted within the tract.
(1984 Code, § 6-02-04-020) (Ord. 11, passed 8-26-1969)
(A) Minimum right-of-way widths.
(1) Major thoroughfares. As indicated on Master Plan and as required by the County Road Commission for County Roads;
(2) Local subdivision streets. Sixty feet;
(3) Neighborhood collector streets. Eighty-six feet;
(4) Boulevard streets. Eighty feet;
(5) “U” streets. One hundred twenty feet, terminating in a circle 120 feet in diameter;
(6) Cul-de-sac streets. Sixty feet, terminating in a circle 120 feet in diameter;
(7) Marginal access streets. Forty feet, abutting thoroughfare right-of-way; and
(8) Alley. Twenty feet.
(B) Grades.
(1) Maximum. All streets, 5%; provided, that where essential to reasonable development,7% may be permitted for collector and minor streets; and
(2) Minimum. Forty hundredths percent (0.40%).
(C) Vertical alignment.
(1) Major thoroughfares. Minimum sight distance, 600 feet, measured on and four feet above street centerline; and
(2) All other streets. Minimum sight distance, 300 feet, measured as in above.
(D) Horizontal alignment.
(1) When tangent centerlines deflect from each other more than ten degrees and less than 90 degrees, they shall be connected by a curve with a minimum radius of:
(a) Collector streets. Three hundred feet; and
(b) Minor streets. One hundred fifty feet.
(2) Between reverse curves there shall be a minimum tangent distance of 100 feet;
(3) Streets intersecting a major thoroughfare shall do so at a 90-degree angle; and
(4) Minor streets intersecting a collector street or major thoroughfare shall have a tangent section of centerline at least 50 feet in length measured from the right-of-way line of the major street; provided, that no such tangent is required when the centerline of the minor street has a curve radius greater than 400 feet with curve center located on the right-of-way line of the major street.
(1984 Code, § 6-02-04-030) (Ord. 11, passed 8-26-1969)
(A) Maximum length of blocks, measured between intersections of centerlines: One thousand three hundred feet. This maximum may be exceeded by not more than 500 feet in developments with lot sizes averaging over one-half acre, or where extreme topographic conditions warrant; and
(B) Maximum length of cul-de-sac and “u” streets, measured from the intersection of right-of-way lines to the extreme depth of turning circle along centerline of street: Six hundred feet. Exceptions shall not be made for the purpose of avoiding the extension of streets to connect with adjoining unplatted or platted parcels.
(1984 Code, § 6-02-04-040) (Ord. 11, passed 8-26-1969)
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