07-16-2018 Planning Commission Packet

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Local 50 feet Parkway 100 feet Culs-de-sac 50 feet radius b. Rights-of-way are needed for future roadways in the opinion of the city. c. Right-of-way widths or additional widths in existing rights-of-way in excess of the standards designated in this chapter when, due to topography, additional width is necessary to provide adequate earth slopes. Such slopes shall not be in excess of 3:1. (b) Railroads and limited -access roadways. Railroad rights-of-way and limited -access roadways where so located as to affect the subdivision of adjoining lands shall be treated as follows: (1) In residential districts, a buffer strip at least 25 feet in depth in addition to the normal depth of the lot required in the district shall be provided adjacent to the railroad right-of-way or limited - access roadway. (2) In districts zoned for business, commercial or industrial uses, the nearest street extending parallel or approximately parallel to the railroad shall be at a sufficient distance to ensure suitable depth for commercial or industrial sites. (3) Streets parallel to the railroad when intersecting a street which crosses the railroad at grade shall be at a distance of at least 150 feet from the railroad right-of-way. Such distance shall be determined with due consideration of the minimum distance required for future separation of grades by means of appropriate approach gradients. (4) Streets crossing the railroads shall be avoided. (c) Intersections. (1) Streets shall be laid out so as to intersect as nearly as possible at right angles. A proposed intersection of two new streets at an angle or less than 75 degrees shall not be acceptable. An oblique street should be curved approaching an intersection and should be approximately at right angles for at least 100 feet from the intersection. Not more than two streets shall intersect at any one point unless specifically approved by the city. (2) Proposed new intersections along one side of an existing street shall coincide with any existing intersections on the opposite side of such street. Intersection jogs with centerline offsets of less than 150 feet shall not be permitted, except where the intersected street has separated dual drives without median breaks at either intersection. Where streets intersect major streets, their alignment shall be continuous. Intersections of arterial roadways shall be at least 800 feet apart. (3) Minimum curb radius at the intersection of two local streets shall be at least 15 feet, and minimum curb radius at an intersection involving a collector street or local streets in a commercial or industrial area shall be at least 25 feet. Alley intersections and abrupt changes in alignment within a block shall have the corners cut off in accordance with standard engineering practice to permit safe vehicular movement. (4) Intersections shall be designed with a flat stopping area of at least 30 feet in a residential area and 60 feet in a commercial or industrial area. The stopping area shall be designed to provide a maximum grade of two percent. (5) Where any street intersection will involve earth banks or existing vegetation inside any lot corner that would create a traffic hazard by limiting visibility, the subdivider shall cut such ground and/or vegetation (including trees) in connection with the grading of the right-of-way to the extent deemed necessary by the city to provide an adequate sight distance. (6) The crown of all streets, including intersections, shall be three percent or less.