A. Specifications: All streets shall be properly integrated with the existing and proposed street system indicated in the village comprehensive plan and official map, and shall meet the specifications set forth in the following table. For divided boulevards, the developer shall submit an acceptable plan for maintenance to the village planning commission.
TABLE OF STREET DESIGN SPECIFICATIONS
Type Of Street
| Permitted On Street Parking
| Required Right Of Way
| Required Pavement Width (B-B)
| Maximum/ Minimum Grades
| |
Type Of Street
| Permitted On Street Parking
| Required Right Of Way
| Required Pavement Width (B-B)
| Maximum/ Minimum Grades
| |
Alley | None | 20' | 18' | Maximum | 10% |
Minimum | 0.5% | ||||
Marginal access | None | 50' | 20' | Maximum | 10% |
Minimum | 0.5% | ||||
Local | 1 side | 50' | 27' | Maximum | 10% |
2 sides | 50' | 31' | Minimum | 0.5% | |
Collector | Both sides | 60' | 40' | Maximum | 10% |
Minimum | 0.5% | ||||
Minor arterial | None | 80' | 11' lanes | Maximum | 5% |
Minimum | 0.5% | ||||
Principal arterial | None | 100' | 12' lanes | Maximum | 5% |
Minimum | 0.5% | ||||
Divided boulevard | None | 70' | 14' | Maximum | 10% |
Minimum | 0.5% | ||||
B. Horizontal Curvatures: All changes in horizontal alignment shall be conducted with a horizontal curve with the following minimum centerline radius, designated "R":
1. For principal, minor and collector streets (design speed equals 35 miles per hour), R shall equal five hundred feet (500');
2. For local streets (design speed equals 30 miles per hour), R shall equal one hundred twenty five feet (125'); and
3. For alleys, R shall equal one hundred feet (100').
C. Through Traffic Discouraged: Marginal access and local streets shall be laid out so as to discourage use by through traffic. The rigid rectangular gridiron street pattern should be avoided, and the use of curvilinear streets, cul-de-sacs, or U-shaped streets shall be encouraged to effect a more desirable street layout.
D. Limited Access To Arterials: Where a subdivision abuts or contains an existing or proposed arterial street, the planning commission may recommend to the village board that access to said arterial may be limited by one of the following means:
1. The subdivision of lots so that they back onto the arterial street and front onto a parallel local street (double frontage lots), coupled with the installation of screening in a reserve (access restricting) strip along the rear lot lines of such lots;
2. A series of cul-de-sacs, U-shaped streets, or short loops entered from and generally at right angles to the arterial street; or
3. A frontage road separated from the arterial street by a planting strip, but having access thereto at suitable points.
E. Dead End Streets:
1. Temporary Stub Streets: Streets shall be so arranged to provide for the continuation of streets between adjacent properties when such continuation is necessary for convenient movement of traffic, effective fire and police protection, and efficient provision of utilities, and where such continuation comports with the village comprehensive plan. If the adjacent property is owned by the developer (under the same ownership) and undeveloped and the street must dead end temporarily, the right of way shall be extended to the property line, and no strip that would prevent connections with future streets shall be reserved. A temporary turnaround shall be provided at the terminus of any temporary dead end street. If the adjacent property is under another ownership, there should be a permanent dead end.
2. Permanent Dead End Streets: Cul-de-sacs shall have a maximum length of seven hundred fifty feet (750'). A cul-de-sac turnaround, having a minimum right of way diameter of ninety eight feet (98'), a minimum pavement return radius of twenty five feet (25'), and a pavement diameter of seventy five feet (75'), shall be provided at the end of every permanent dead end street.
F. Alleys: Alleys shall be prohibited in single-family residence districts. Alleys may be required in multiple-family districts and in commercial/industrial districts unless other adequate provisions for service access are made. Adequate vehicular turnaround space shall be provided at the terminus of any dead end alley.
G. Intersections:
1. Two Streets Only: Not more than two (2) streets shall intersect at any one point.
2. Right Angles: Streets shall be laid out so as to intersect as nearly as possible at right angles. In no case shall two (2) streets intersect at an angle of less than eighty degrees (80°) or more than one hundred degrees (100°). An oblique street shall be curved approaching an intersection and shall be approximately at right angles with said intersection for at least one hundred feet (100') therefrom.
3. Alignment: Proposed new intersections along one side of an existing street shall, wherever practicable, coincide with any existing intersections on the opposite side of such street. Street jogs with centerline offsets of less than one hundred twenty five feet (125') shall not be permitted, except where the intersected street has divided lanes without median breaks at either intersection. Intersections involving collector or arterial streets shall be at least eight hundred feet (800') apart.
4. Curb Radii: To permit safe vehicular movement at corners, the minimum curb radius at the intersection of two (2) streets shall be fifteen feet (15') where both streets are marginal access or local, and at other intersections, not less than twenty five feet (25').
5. Grade: Intersections shall be designed with a minimum grade of one-half of one percent (0.5%). In hilly terrain, an area having not greater than a two percent (2%) slope for a distance of sixty feet (60') from the nearest right of way line of the intersecting street shall be provided at the approach to an intersection.
6. Cross Slope: The cross slopes of all streets, including intersections, shall not exceed three percent (3%).
7. Adequate Sightlines:
a. Where any street intersection will involve earth banks or existing vegetation, the developer shall cut such ground and/or vegetation (including trees) in connection with the grading of the public right of way to the extent necessary to provide adequate sight distance in accordance with the following:
30 miles per hour | 130 feet each way from intersection |
35 miles per hour | 155 feet each way from intersection |
b. For design speeds exceeding thirty five (35) miles per hour, sight distance will be determined based upon AASHTO criteria.
H. Reverse Curves: A tangent at least fifty feet (50') long shall be introduced between reverse curves on local streets and one hundred feet (100') long on collector streets.
I. Road Dedications And Reservations And Improvements To Existing Streets:
1. New Perimeter Streets: Street systems in new subdivisions shall be laid out so as to eliminate or avoid new perimeter half streets. Where an existing half street is adjacent to a new subdivision, the other half of the street shall be improved and dedicated by the subdivider. The planning commission may authorize a new perimeter street where the subdivider improves and dedicates the entire required street right of way width within his own subdivision boundaries.
2. Existing Roads: Where a subdivision borders an existing narrow road or when the comprehensive plan, official map, or zoning setback regulations indicate plans for realignment or widening a road that would require use of some of the land in the subdivision, the applicant shall be required to improve and dedicate, at his expense, such areas for widening or realignment of such roads as are specifically and uniquely attributable to his subdivision and to reserve for public use any portion of the right of way determined not to be specifically and uniquely attributable to his subdivision.
3. Excess Right Of Way: Right of way in excess of the standards set forth in the table of street design specifications shall be required to be dedicated when:
a. Due to topography, additional width is necessary to provide adequate earth slopes; or
b. Due to the location of railroad tracks, additional width is needed to construct overpasses, underpasses, and approaches thereto.
4. Definition: For purposes of this subsection, the phrase "specifically and uniquely attributable" shall mean, as a minimum, that areas currently zoned or to be zoned single- family for residential uses in the comprehensive plan shall require marginal access, local, or collector streets, depending on density; that areas currently zoned or to be zoned for multi-family residential uses in the comprehensive plan shall require local, boulevard, collector, minor arterial, or principal arterial streets, depending on density; that areas currently zoned or to be zoned for commercial uses in the comprehensive plan shall require local, collector, minor arterial, or principal arterial streets, depending on whether same is a neighborhood, community, or regional area; and that areas currently zoned or to be zoned for industrial uses in the comprehensive plan shall require collector, minor arterial, or principal arterial streets, depending on the size of the industrial area. (Ord. 1334, 4-18-2005)