(a) Arrangement. The arrangement, character, extent, width and location of all streets shall conform to the locally adopted Land Use and Thoroughfare Plan. The design of proposed streets shall provide for both the continuation of existing streets and access to adjacent unplatted lands, so that the entire area can be served with a coordinated 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. They shall contain as few intersections with minor streets as possible. Such thoroughfares should traverse the community and be spaced approximately one mile apart.
(2) Collector streets shall provide a traffic route from local streets to major arterial thoroughfares. These streets should be spaced at least one-fourth mile apart.
(3) Local streets shall provide direct and full access to each lot and shall be laid out so that their use by through traffic will be discouraged.
(4) Cul-de-sac streets are permitted in a residential area to discourage through traffic and promote public safety. Such streets should not be greater than 600 feet in length except where existing topographic conditions discourage the use of an alternate street pattern. Cul-de-sac streets shall normally have a sixty-foot right of way terminating in a turnaround having a minimum outside paving radius of fifty feet and a property line radius not less than sixty feet.
(5) Parallel streets may be required along an existing or proposed major arterial thoroughfare to provide access to lots along such major arterial thoroughfares.
(6) Service drives shall be designed to provide only secondary access.
(c) Street Right-of-Way Widths and Grades.
Street Classification | Minimum R-O-W width (in feet) | Grades (by percent) | |
Maximum | Minimum | ||
Major arterial thoroughfare | 100 | 5 | .6 |
Collector streets | 80 | 7 | .5 |
Local streets | 60 | 8 | .5 |
Local streets | 60 | 8 | .5 |
Cul-de-sac streets | 60 | 8 | 1.0 |
Parallel streets | 40 | 8 | .5 |
Service drives | 30 | 8 | .5 |
(d) Half Streets. Half streets shall be prohibited except where there is an existing half street adjacent to the subdivision, in which case the remaining half of the street shall be platted.
(e) Temporary Turnaround and Dead-End Streets. If such a street is of a temporary nature and a future extension into adjacent land is anticipated, then the turning circle beyond the normal street width shall be in the nature of an easement over the premises included in such turning circle, but beyond the boundaries of the street proper. Such easements shall be automatically vacated to abutting property owners, when the dead-end street is legally extended into adjacent land. If such dead-end street extends only one lot depth past a street intersection, no turnaround will be required.
(f) Horizontal and Vertical Curves. Angles in the alignment of street lines shall be connected by a curve with a radius on the center line of not less than 200 feet for local streets, 300 feet for collector and industrial streets and 500 feet for major arterial thoroughfares. Between reverse curves there shall be a tangent at least 100 feet long on major arterial thoroughfares. Every change in street grade shall be made with a vertical curve to provide distance suited to the location, which in no case shall be less than 300 feet from a height of four and one-half feet.
(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 seventy-five degrees. In no event shall an intersection containing streets in excess of four be approved.
(h) Street Jogs. Street jogs with center line offsets of less than 125 feet shall be prohibited. If deemed necessary by the Planning Commission, the minimum distance between center line offsets may be increased.