The final plat of the subdivision shall conform to the following principles and standards of design.
(A) General. The subdivision plan shall conform to the principles and standards which are generally exhibited in the master plan.
(B) Streets.
(1) The street and alley layout shall provide access to all lots and parcels of land within the subdivision and, where streets cross other streets, jogs shall not be created.
(2) Proposed streets shall be adjusted to the contour of the land so as to produce useable lots and streets of reasonable gradient.
(3) Certain proposed streets, where appropriate, shall be extended to the boundary line of the tract to be subdivided so as to provide for normal circulation of traffic within the vicinity.
(4) Wherever there exists a dedicated or platted portion of a street or alley adjacent to the proposed subdivision, the remainder of the street or alley to the prescribed width shall be platted within the proposed subdivision.
(5) Widths of arterial streets shall conform to the widths stated in the thoroughfare plan.
(6) The minimum right-of- way of feeder streets shall be 60 feet. The minimum right-of-way for residential streets, marginal access streets or cul-de-sacs shall be 50 feet. All cul-de-sacs shall terminate in a circular right-of-way with a minimum diameter of 100 feet.
(7) Alleys shall be discouraged in residential districts, but should be included in commercial and industrial areas, where needed, for loading, unloading or access purposes and, where platted, shall be at least 20 feet in width.
(8) The centerlines of streets should intersect as nearly at right angles as possible.
(9) At intersections of streets and alleys, property line corners shall be rounded by arcs of at least 20 feet radii or by chords of such arcs.
(10) At intersections of streets the property line corners shall be rounded by arcs with radii of not less than 15 feet or by chords of such arcs.
(11) If the smaller angle of intersection of two streets is less than 60 degrees, the radius of the arc at the intersection of property lines shall be increased as deemed advisable by the town’s Plan Commission.
(12) Intersections of more than two streets at one point shall be avoided.
(13) Where parkways or special types of streets are involved, the Commission may apply special standards to be followed in their design.
(14) Whenever the proposed subdivision contains or is adjacent to a railroad right-of-way or a highway designated as a limits access highway by the appropriate highway authorities, provision shall be made for a marginal access street or a parallel street at a distance acceptable for the appropriate use of the land between the highway or railroad and these streets.
(15) Horizontal visibility on curved streets and vertical visibility on all streets must be maintained along the centerline as follows.
(a) Limited access highways. Horizontal visibility and vertical visibility be determined by the Commission, but generally shall not be less than 500 feet.
(b) Arterial streets and parkways. Visibility shall be 400 feet.
(c) Feeder and residential streets. Visibility shall be 150 feet.
(16) Curvature measured along the centerline shall have a minimum radius as follows.
(a) Limited access highways. Curvature shall be 1,000 feet.
(b) Arterial streets. Curvature shall be 500 feet.
(c) Parkways. Curvature shall be 300 feet.
(d) Feeder and residential streets. Curvature shall be 100 feet.
(17) Between reversed curves on arterial streets, a tangent of not less than 100 feet shall be provided, and on feeder and residential streets such a tangent shall be not less than 40 feet.
(18) Maximum grades.
(a) For arterial streets, the maximum grade shall not be greater than 6%.
(b) For feeder and residential streets and alleys, the maximum grade shall not be greater than 8%.
(c) The minimum grade of any street gutter shall not be less than 0.3%.
(C) Blocks.
(1) Blocks shall not exceed 1,250 feet in length.
(2) Blocks shall be of sufficient width to permit two tiers of lots of appropriate depth, except where an interior street parallels a limited access highway or an arterial street.
(D) Lots.
(1) All lots shall abut on a street.
(2) Side lines of lots shall be at approximately right angles to straight streets and on radial lines on curved streets. Some variation from this rule is permissible, but pointed or very irregular lots should be avoided.
(3) Double frontage lots should not be platted; however, where desired along arterial, limited access highways or streets, lots may face on an interior street and back on these thoroughfares. In that event, a planting strip for a screen at least 20 feet in width shall be provided along the back of the lot.
(4) Widths and areas of lots shall be not less than provided in Ch. 154 of this code of ordinances for single-family dwellings for the district in which the subdivision is located. However, when a water main supply system or a sanitary sewer system are not available, the lot area necessary to install a private water supply or private sewage disposal on the lot in accordance with the state’s Board of Health regulations shall become the required minimum lot area.
(5) Wherever possible, unit shopping centers based upon sound development standards should be designed in contrast to the platting of lots for unrestricted commercial use.
(6) Corner residential lots shall be wider than normal in order to permit appropriate setbacks from both streets.
(E) Easements. Where alleys are not provided, easements for utilities shall be provided. Such easements shall have minimum widths of ten feet, and where located along lot lines, one-half the width shall be taken from each lot. Before determining locations, the plan of easements shall be discussed with the local public utility companies to assure their proper placing for the installation of such services. There shall be no blocking of, or building in, any easement.
(F) Building setback lines. Building setback lines shall be provided in Ch. 154 of this code of ordinances or as the town’s Plan Commission may determine, but in no case shall it be less than 20% of the lot depth.
(G) Public open spaces. Where sites for parks, schools, playgrounds or other public uses are located within the subdivision area as shown on the master plan, or where such sites appear to be desirable, the Commission may request their dedication for these purposes, or their reservation for a period of one year following the date of the final approval of the plat. In the event a governmental agency concerned passes a resolution expressing its intent to acquire the land so reserved, the reservation period shall be extended for an additional six months.
(H) Variance. Where the subdivider can show that a provision of this section would cause unnecessary hardship if strictly adhered to and where, in the opinion of the Commission, because of topographical or other conditions peculiar to the site, a departure may be made without destroying the intent of the provision, the Commission may authorize a variance. Any variance thus authorized is required to be entered in writing in the minutes of the Commission and the reasoning on which the departure was justified shall be set forth.
(Prior Code, § 153.14) (Ord. 2-1957, passed - -)