(a) Arrangement. The arrangement, character, extent, width, and location of all streets, shall conform to the comprehensive plan. The design of proposed streets shall provide for both the continuation of existing streets and public access to adjacent unplatted lands so that the entire area can be served with a coordinated public street system.
(b) Classifications:
(1) Major arterial thoroughfares shall be planned for continuation of movement of fast traffic between points of heavy traffic generation and from one section of the community to another. These thoroughfares shall contain as few intersections with minor streets as possible.
(2) Collector streets shall provide a traffic route from local streets to major arterial thoroughfares. These streets shall be spaced at least 1/4 mile apart.
(3) Local streets shall provide direct and full access to each lot and shall be laid out so as to discourage their use by through traffic. The street system shall be so designed that all proposed streets shall be in conformity with modern practices of land subdivision and with a plan for the most advantageous development of the entire neighborhood.
(4) Parallel streets may be required along an existing or proposed major arterial thoroughfare to provide access to lots along those thoroughfares.
(5) Industrial streets shall provide adequate access to industrial land for industrial, automobile, and truck traffic.
(c) Right-of-way Widths and Grades.
Classification | Minimum right-of-way Width (Ft.) | Grades (percent) | |
Max. | Min. | ||
Major arterial thoroughfares | 80 | 10 | .5 |
Collector streets | 60 | 10 | .5 |
Local streets | |||
Urban single-family | 50 | 10 | .5 |
Urban multi-family | 50 | 10 | .5 |
Light industrial | 50 | 10 | .5 |
Parallel streets | 40 | 10 | .5 |
(d) Cul-de-sac and Dead-end Streets:
(1) Any street designed to be a permanent cul-de-sac street shall be not longer than 800 feet and shall be provided at the closed end with a turnaround having a minimum pavement diameter of 75 feet and a minimum street property line diameter of 100 feet.
(2) If a cul-de-sac street is of a temporary nature and future extension into adjacent land is anticipated, then the turnaround beyond the normal street width shall be in the nature of an easement over the premises included in the turnaround but beyond the boundaries of the street proper. The easements shall be automatically vacated to abutting property owners when the dead-end street is legally extended into adjacent land. If the dead-end street extends only one lot depth past a street intersection, no turnaround shall be required. Subdividers shall be required to deed in fee to the City a strip of land 2 feet in width at the end of each dead-end street. The strip shall become public highway only upon the extension of the dedicated street.
(e) Corner Radii. Property lines at street intersections shall be rounded with a radius of not less than 30 feet for major arterial thoroughfares, collector streets, and industrial streets, and not less than 15 feet for local streets.
(f) Horizontal and Vertical Curves. Angles in the alignment of street lines shall be connected by a curve with a radius on the centerline of not less than 200 feet for local streets, 300 feet for collector streets and industrial streets, and 500 feet for major arterial thoroughfares. Between reverse curves there shall be a tangent not less than 100 feet long on major arterial thoroughfares. Every change in street grade shall be made with a vertical curve to provide sight distance suited to the location, which distance shall not be less than 300 feet from a height of 4-1/2 feet. Horizontal and vertical curves shall also conform to the City Engineer's specifications.
(g) Intersections. Streets shall be laid out to intersect as nearly as possible at right angles, and no street shall intersect any other street at an angle of less than 60 Degrees. In no event shall an intersection containing more than 4 streets be approved. Street intersections with centerline offsets of less than 100 feet are prohibited. If deemed necessary, the minimum distance between centerline offsets may be increased.
(Ord. 2007-222. Passed 1-10-08.)