A. Conformance to General Development Plan: The subdivision of land, including the arrangement, character, extent, width, grade and location of all streets, alleys or other land to be dedicated for public use shall conform to the General Development Plan of the Village as approved and adopted by the Village Board. Consideration shall be given to their relation to existing and planned streets, to topographic and soil conditions, to public safety and convenience, to their appropriate relation to the proposed uses of land to be served by such streets and to the provisions of Section 6-3-1 above.
B. Minimum Right of Way and Pavement Widths:
1. The minimum widths of rights of way, and respective pavement widths, for streets to be dedicated or established after the effective date hereof, within the Village or its environs under the jurisdiction of this Title, shall conform to the following schedule:
Classification
|
Width of Right of Way
| Minimum Pavement
Width (Edge to Edge)
|
Classification
|
Width of Right of Way
| Minimum Pavement
Width (Edge to Edge)
|
Primary streets or major streets | 80' or 100', located in accordance with General Development Plan | 24' |
Collector or secondary streets | 66' to 80', located in accordance with General Development Plan | 20' |
Minor streets | 66' | 20' |
Cul-de-sac termini | 50' radius | 20' |
Crosswalkways | 10' | |
Drainage easements | As approved by the Village Engineer | |
Utility easements | 10' minimum | |
Village easements | As approved by the Village Engineer | |
C. Design Standards:
1. Minor streets shall be so laid out that their use by through traffic will be discouraged.
2. Clear visibility, measured along the center line of the street shall be provided for at least three hundred feet (300') on all primary streets; two hundred feet (200') on all secondary streets; and at least one hundred feet (100') on all other streets.
3. All street intersections and confluences must give clear evidence of being conducive to safe traffic flow.
4. Alleys:
a. Alleys must be provided in commercial and industrial districts unless provisions are made for service access such as off-street loading, unloading and parking consistent with and adequate for the uses proposed.
b. Alleys shall be prohibited in residential areas.
c. The width of an alley shall not be less than twenty feet (20') nor more than forty feet (40').
5. Each cul-de-sac shall have a terminus of nearly circular shape with a minimum diameter of one hundred feet (100'); the pavement shall have a minimum diameter of fifty feet (50'). There shall be no center islands.
6. Half streets shall be prohibited. No strip or area shall be reserved along any portion of a street, half street or alley which will prevent adjacent property owners access thereto.
7. No street names may be used which will duplicate or be confused with the names of existing streets, provided that existing street names shall be used on all continuations of existing streets.
8. If the tract of land proposed to be subdivided or any part thereof lies adjacent to a highway over which the Illinois Department of Transportation or Cook County has jurisdiction with respect to maintenance and upkeep thereof, and an entrance or entrances are desired from such highway to lots, streets, roadways or alleys in such proposed subdivision, the subdivider shall submit to the Village Engineer a written permit from the appropriate authority granting him permission to obtain and construct such an entrance or entrances.
9. Landmarks, large trees or natural or man-made structures of unusual or unique beauty or historical interest shall be preserved.
10. Wherever possible, driveways, private streets or minor streets shall not enter directly onto primary streets. (1983 Code)
D. Street Standards and Specifications:
1. Standard Street Cross Section: A standard street cross section shall consist of the pavement width herein specified with a minimum six foot (6') shoulder on each side, consisting of permanent seeding or sodding in accordance with the Standard Specifications for Road and Bridge Construction of the State of Illinois (SSRBC), Current Edition, or such shoulders shall otherwise be improved in a manner specifically approved, in writing, by the Village Board. All seed shall be properly fertilized and maintained until acceptance of the subject streets by the corporate authorities.
Ditches shall normally have a four foot horizontal to a one foot vertical (4:1) cross slope and shall have a minimum width of four feet (4'). Maximum depth of ditches below center line of road grade shall be twenty four inches (24") unless otherwise specified by the Village Engineer.
The pavement crown at the center line shall be three inches (3") above the edge of the pavement.
Back slopes, where necessary to meet existing grades, shall be a three foot horizontal to one foot vertical (3:1) slope and shall be extended to meet existing ground lines.
Street cross sections shall be standard in all locations with the exceptions of the actual pavement width and ditch sections as hereinbefore specified. Cross-sectional areas of ditches may vary to accommodate design storm flows and topographical conditions along the back slopes. (Ord. 93-483, 6-8-93)
2. Excavation: Excavated materials shall be placed in locations not offensive to the subdivision and shall not be placed in the vicinity of a proposed building site. All subgrade material and construction methods shall be in accordance with SSRBC, Current Edition.
3. Pavement:
a. Base Course: The base course requirements for all minor streets shall consist of a minimum of ten inches (10") compacted thickness for crushed stone (CA-6), or other equivalent designs approved by the Village Engineer; pozzolanic and cement stabilized base courses shall not be allowed. The above designs are based on a minimum IBR value of 3.0. If the lowest IBR value is lower than 3.0, the subgrade shall be removed and replaced with suitable material in a manner which will provide a stabilized subgrade whose compacted density is ninety five percent (95%) modified proctor. Major and collector streets shall be designed using the Manual of Instructions for Structural Design of Flexible Pavement prepared by the Department of Transportation, Division of Highways, State of Illinois, dated January, 1976. Whenever a roadway is intended to serve a future unit of subdivision, a special pavement design may be required by the Village Engineer.
No base course work shall be constructed until after the subgrade has been inspected and approved by the Village Engineer. No binder and surface course work shall be started until the base course work has been so inspected and approved. The Village Engineer may require proof-rolling, compaction testing or other evidence to demonstrate acceptable construction.
b. Binder and Surface Courses: The binder course shall consist of a bituminous plant mix material (Class I) with a minimum compacted thickness of one and one-half (11/2"). The surface course shall consist of a bituminous plant mix material (Class I) with a minimum compacted thickness of one inch (1").
4. Street Plans: Engineering plans and specifications for all street improvements being proposed within the Village of Inverness shall be prepared by a Registered Professional Engineer and shall conform to the following regulations:
a. No centerline street grade shall be less than five-tenths percent (0.5%) nor more than eight percent (8.0%).
b. The minimum ditch slope shall be one percent (1.0%). Ditch flow velocities shall not exceed four feet (4') per second. Ditch checks or other approved dissipators shall be used to maintain acceptable velocities.
c. No sharp curves or right angles shall be permitted for the length of any street.
d. All corner radii of pavement shall have minimum radius of twenty five feet (25').
e. No street intersections shall be made at less than seventy degrees (70°) and shall be made at ninety degrees (90°) unless existing conditions warrant a change not in excess of the seventy degrees (70°) aforementioned.
f. All plans shall indicate elevations based on United States Geological Survey sea level datum and with sufficient information on existing improvements or conditions. All drainage ditches, storm sewers and driveway culverts shall be designed on the basis of a storm event whose return frequency is twenty five (25) years, for all durations up to twenty four (24) hours.
g. All engineering plans and specifications shall be submitted to the Village Engineer and the Board of Trustees of the Village for approval before any construction can be instituted.
h. After engineering plans and specifications have been approved by the Village Engineer and the Village Board, no revisions shall be allowed without express permission of the Village Board upon the advice of the Village Engineer.
i. All materials used on street projects shall be of the style, type and size previously mentioned and the materials shall be subject to inspection by the Village and its authorized representatives. The site must remain open for investigation by all authorized Village officials.
5. Acceptance: Before return or release of any security posted with the Village, the subdivider shall obtain a statement from the Village Engineer stating that all construction has been substantially completed in accordance with plans and specifications submitted and have been completed in accordance with the applicable standards and shall obtain final approval of the Board of Trustees.
The acceptance of completed streets by the Village in no way relieves the subdivider of responsibility for negligent or careless acts. The acceptance of the streets, however, does constitute an official recognition by the Village of its responsibility for the maintenance of the streets from the date of acceptance. All streets shall then become the property of the Village and no further work shall be done by the subdivider unless specific authorization is given by the appropriate Village authority.
6. Indemnification of the Village: During the construction of the improvements and until the Village Board has accepted said improvements by ordinance or resolution, the Village shall not be responsible for any liability incurred and the owner and contractor shall agree to hold harmless and indemnify the Village from all liability arising out of or resulting from the construction of such improvements.