(A) Conformity to comprehensive plan or official map. Whenever a tract of land to be subdivided or resubdivided includes any part of, or is adjacent to, a proposed arterial or collector street as designated on the comprehensive plan or the official map, the subdivider shall meet with the Planning Commission’s duly authorized representative to determine its compliance (such as, right-of-way width for future widening and pavement widths) and resulting design requirements of such locations, otherwise such street right-of-way shall be platted by the subdivider in the exact location so designated and at the width indicated in these regulations.
(B) Street extension.
(1) Existing streets. The arrangement of streets in new subdivisions shall make provision for the proper continuation of existing streets in adjoining areas, unless determined otherwise by the Planning Commission, or its duly authorized representative.
(2) Adjacent property. Where adjoining areas are not subdivided and are appropriate for future subdivision, arrangement of streets in new subdivisions shall make provision for the proper projection of streets to those adjoining areas in a manner which shall provide for the practical development of the adjacent property.
(3) Half streets. Dedication of one-half of the rights-of-way (half streets) for streets proposed along the boundaries of land to be subdivided shall be prohibited.
(C) Street classification and function.
(1) Arterial streets.
(a) Arterial streets should be planned so as to provide for the smooth flow of traffic between points of heavy traffic generation and from one section of the community or communities to another. Such arterial streets should traverse the entire community or communities.
(b) Arterial streets should not bisect neighborhoods, but should act as boundaries between such neighborhoods.
(c) Direct access onto the roadway from abutting properties shall be discouraged.
(2) Collector streets. Collector streets should be designed to provide a traffic route from subcollector streets to arterial streets. These streets should be designed to carry traffic which has an origin or destination within the neighborhood and between arterial streets. Streets shall be designed in such a manner to discourage short cuts through the neighborhood. Direct access to abutting property should be discouraged whenever possible.
(3) Subcollector streets. Subcollector streets shall be designed to provide a traffic route from local streets to collector streets. The streets will serve equally both traffic movement and abutting properties.
(4) Local streets, including cul-de-sacs and courts. Local streets shall provide direct and full access to each lot and direct traffic movement to another local street or to a subcollector street. The street shall be laid out so that their use by through traffic will be discouraged. Local street intersections with arterial streets shall be discouraged, wherever practical.
(5) Frontage roads. Frontage roads may be required along an existing or proposed arterial street to provide access to lots along such streets.
(6) Alleys. Where alleys are to be provided (such as in the case of certain commercial development), they shall be designed to provide only secondary access.
(D) Street rights-of-way.
(1) Widths and grades of new streets. Street right-of-way widths and grades shall conform to the following minimum requirements:
TABLE 1 STREET RIGHTS-OF-WAY WIDTH AND GRADE REQUIREMENTS | |||
Type of Street
|
Minimum Right-of-Way Width (in feet) *** | Grades by Percent | |
Maximum | Minimum | ||
TABLE 1 STREET RIGHTS-OF-WAY WIDTH AND GRADE REQUIREMENTS | |||
Type of Street
|
Minimum Right-of-Way Width (in feet) *** | Grades by Percent | |
Maximum | Minimum | ||
Alleys | 20 | 10 | 0.5 |
Arterial | * | * | * |
Collector | 60 | 10 | 0.5 |
Courts | 40 | 12 | 0.8 |
Frontage road | ** | ** | ** |
Local (including cul-de-sacs) | |||
Residential | 50 | 12 | 0.8 |
Commercial and industrial areas | 60 | 10 | 0.8 |
Subcollector | 50 | 12 | 0.8 |
NOTES TO TABLE: * Arterial streets shall be based on current design standards and other pertinent requirements of the state’s Department of Transportation and the official area-wide comprehensive plan. ** Requirements will vary for a frontage road depending on whether the street would serve as a local subcollector or collector type street and as such would be designed in accordance with the respective requirements of the streets. | |||
(2) Exiting streets. Subdivisions platted along existing streets shall dedicate additional right-of-way, if necessary, to meet the minimum street width requirements set forth in division (D)(1) above. Such dedication shall be in accordance with the following.
(a) At least the minimum right-of-way width shall be dedicated where the subdivision is on both sides of an existing street.
(b) When the subdivision is located on only one side of an existing street, one-half of the required right-of-way width, measured from the centerline of the right-of-way, shall be dedicated. However, the owner or owners of such property shall not be required to dedicate more than one-half of the required rights-of-way width.
(E) Curves and sight distance criteria.
(1) Horizontal curve. Where there is a change in the alignment of a street along the centerline, a curve with a radius adequate to ensure safe sight distance shall be constructed. The minimum radii of curves shall be:
Street Type | Minimum Curve Radius
|
Arterial | * |
Collector | 400 feet |
Local or subcollector | 100 feet |
(2) Sight distance. Minimum sight distance shall be as required in App. E, Tables 7a and 7b.
(3) Reverse curves. A tangent of at least 200 feet for collector streets shall be provided between reverse curves. No tangent shall be required for local and subcollector streets.
(4) Vertical curves. The minimum vertical curve length required shall be calculated by multiplying the algebraic difference in grades times a “K” factor. Rounded “K” factors for local and subcollector and collector streets are as follows:*
Type of Street | “K” Factors
|
Collector | K equals 30 for crest curves |
K equals 35 for sag curves | |
Local and subcollector | K equals 15 for crest curves |
K equals 15 for sag curves | |
NOTES TO TABLE: * Design of arterial streets shall be based on current standards of the state’s Department of Transportation. | |
(F) Cul-de-sac and dead-end streets. Cul-de-sacs and dead-end streets designed to be dead-end permanently shall not be longer than 1,200 feet, unless local topographic or other physical conditions are such as to render these provisions impracticable.
(G) Street names and house numbers.
(1) Duplication. The name of a new street shall not duplicate existing or platted street names in the county, or approximate such names in spelling, or sound or pronunciation, or by the use of alternate prefixes such as “North”, “South” or such suffixes as “Lane”, “Way”, “Drive”, “Court”, “Avenue” and “Street”.
(2) Continuation of streets. New street names shall bear the same name of any continuation of, or when in alignment with, an existing or platted street.
(3) Approval of street names. All street names shall be approved by the Planning Commission’s duly authorized representative before approval of the final plat.
(4) House numbers. House numbers shall be assigned by the Planning Commission’s duly authorized representative before approval of the final plat.
(H) Alleys.
(1) Alleys shall be prohibited in residential zoning districts, unless otherwise approved by the Planning Commission or its duly authorized representative.
(2) In commercial and industrial areas, adequate alleys shall be provided where the design requires. Alleys shall not serve as part of the required off-street parking, loading or unloading space required by the applicable zoning ordinance.
(I) Private streets. New private streets or alleys shall not be created or extended, except as approved by the Planning Commission, and existing ones shall, whenever practicable, be dedicated to the public.
(1984 Code, § 157.55) (Ord. O-86-78, passed 8-17-1978; Ord. O-28-79, passed 3-22-1979) Penalty, see § 157.999