(A) 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.
(B) Proposed streets shall be adjusted to the contour of the land so as to produce usable lots and streets of reasonable gradient.
(C) 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.
(D) 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.
(E) Widths of primary, secondary, and feeder streets shall conform to the width specified in the Official Thoroughfare Plan.
(F) The minimum right-of-way of local streets or culs-de-sac in urban areas shall be 50 feet. The minimum right-of-way of feeder streets in rural areas shall be 50 feet unless otherwise designated by the Official Thoroughfare Plan as requiring a minimum right-of-way of 60 feet. All culs-de-sac shall terminate in a circular right-of-way with a minimum diameter of 100 feet, or other arrangement for the turning of all vehicles conveniently within the right-of-way.
(G) Alleys shall be discouraged in residential districts but should be included in commercial and industrial areas where needed for loading and unloading or access purposes, and where platted shall be at least 20 feet in width.
(H) The center lines of streets should intersect as nearly at right angles as possible.
(I) 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.
(J) 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.
(K) 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 Plan Commission.
(L) Intersections of more than two streets at one point shall be avoided.
(M) Where parkways or special types of streets are involved, the Plan Commission may apply special standards to be followed in their design.
(N) Whenever the proposed subdivision contains or is adjacent to a railroad right-of-way, a primary or a secondary street, provision shall be made for a marginal access street, or a parallel street adjacent to such railroad right-of-way or primary or secondary street. As a general principle, intersections of such marginal access streets or parallel streets shall not exist at less than 1/4-mile intervals with primary streets or at less than 1/8-mile intervals with secondary streets.
(O) Horizontal visibility on curved streets and vertical visibility on all streets must be maintained along the center lines as follows:
(1) Primary streets: 500 feet.
(2) Secondary streets: 300 feet.
(3) Feeder streets: 150 feet.
(P) Curvature measured along the center line shall have a minimum radius as follows:
(1) Primary streets: 500 feet.
(2) Secondary streets: 300 feet.
(3) Feeder streets: 200 feet.
(Q) Between reversed curves on primary and secondary streets there shall be a tangent of not less than 100 feet and on feeder and residential streets such tangent shall be not less than 40 feet.
(R) Maximum grades for streets shall be as follows:
(1) Primary and secondary streets, not greater than 6%.
(2) Local streets and alleys, not greater than 8%.
(S) The minimum grade of any street gutter shall not be less than 0.3%.
(Ord. passed 3-9-70) Penalty, see § 10.99