(A) General considerations.
(1) Streets shall be designed and located in relation to existing and planned streets, to topographical conditions and natural terrain features such as streams and existing and natural terrain features such as streams and existing tree growth, to public convenience and safety, and in appropriate relation to the proposed uses of land to be served by the streets.
(2) All streets and highways are to be developed to urban standards unless otherwise designated.
(a) The Village Trustees have the responsibility of determining the construction and design standards applicable to any and all segments of the Village street system, since public improvements such as water, sewage disposal, drainage, street reconstruction, sidewalk installations along with other utilities and traffic improvements may eventually be undertaken and financed from public tax sources.
(b) It shall be the subdivider’s responsibility to initiate any requests for exception to the urban street improvement standards and show cause why the rural standards are applicable in his or her particular case.
(B) Arrangement.
(1) All streets shall be properly integrated with the existing and proposed systems of thoroughfares and dedicated rights-of-way as established on the official map of the Village.
(2) All thoroughfares shall be properly related to special traffic generators such as industries, business districts, schools, churches, and shopping centers; to population densities and to the pattern of existing and proposed land uses.
(3) Minor streets shall be laid out to conform as much as possible to the topography, to discourage use by through traffic, to permit efficient drainage and utility systems, and to require the minimum number of streets necessary to provide convenient, safe access to property.
(4) The rigid rectangular gridiron street pattern need not necessarily be adhered to, and the use of curvilinear streets, cul-de-sacs, or U-shaped streets shall be encouraged where the use will result in a more desirable layout.
(5)
Proposed streets shall be extended to the boundary lines of the tract to be subdivided, unless prevented by topography or other physical conditions, or unless in the opinion of the Village Board of Trustees the extension is not necessary or desirable for the coordination of the layout of the subdivision with the existing layout or the most advantageous future development of adjacent tracts.
(6) In business and industrial developments the street and other accessways shall be planned in connection with the grouping of buildings, location of rail facilities, and the provision of alleys, truck loading and maneuvering areas, fire protection and walks and parking areas so as to minimize conflict of movement between the various types of traffic, including pedestrian.
(C) Railroad and highways. Railroad rights-of-way and limited-access highways, where so located as to affect the subdivision of adjoining lands, shall be treated as follows:
(1) In residential districts a buffer strip at least 25 feet in depth in addition to the normal depth of the lot required in the district shall be provided adjacent to the railroad right-of-way or limited-access highway. This strip shall be part of the platted lots and shall be designated on the plat: “This strip is reserved for the planting of trees and shrubs by the owner. The placement of structures hereon is prohibited.”
(2) In districts zoned for business, commercial, or industrial uses the nearest street extending parallel to the railroad shall, wherever practicable, be at a sufficient distance therefrom to ensure suitable depth for commercial or industrial sites.
(3) Streets parallel to the railroad when intersecting a street which crosses the railroad at grade shall, to the extent practicable, be at a distance of at least 150 feet from the railroad right-of-way. This distance shall be determined with due consideration of the minimum distance required for future separation of grades by means of appropriate approach gradients.
(D) Access to major streets.
(1)
Where a subdivision borders on or contains an existing or proposed major street, the Village Board of Trustees may require that access to these streets be limited by 1 of the following means:
(a) The subdivision of lots so as to back onto the major street and front onto parallel local street; no access shall be provided from the major street and screen planting shall be provided in a strip of land along the rear property line of the lots;
(b) A series of cul-de-sacs, U-shaped streets, or short loops entered from and designed generally at right angles to such a parallel street, with the rear lines of their terminal lots backing onto the major street; or
(c) A marginal access or service street (separated from the major street by a planting or grass strip and having access thereto at suitable points).
(2) The number of residential streets entering a major street shall be kept to a minimum.
(E) Design criteria.
(1) Right-of-way width for new construction. The minimum right-of-way shall be 66 feet for rural residential streets, 60 feet for urban residential streets, 80 feet for industrial and collector streets, and 120 feet for arterial streets.
(2) Design speed. The design speed, in miles per hour, for determining the roadway geometry design for the various street classifications, shall be as follows:
Urban | Rural | |
Arterial | 35 | 40 |
Collector | 35 | 35 |
Industrial/Commercial | 25 | 25 |
Residential | 30 | 30 |
(3) Widths/thickness.
(a) Urban residential streets shall have a minimum pavement width of 30 feet for the base, curb and gutter, and surface, with a minimum of 10 inches of a gravel or crushed stone base, and 3 inches of a bituminous mix for the surface. Collector streets shall have a minimum pavement width of 40 feet for the base and surface.
(b) Commercial/industrial streets shall have a minimum pavement width of 32 feet for the base and the surface, with a minimum of 12 inches of a gravel or crushed stone base, and 4 inches of a bituminous mix or concrete equivalent for the surface.
(Ord. 1995-34, passed 6-20-1996
; Am. Ord. 2007-71, passed 12-20-2007
)
(4) Curb and gutter.
(a) B-6.18 concrete curb and gutter shall be installed on both sides of the all Urban Residential and Commercial/Industrial streets, and shall be constructed according to IDOT standards. Curb and gutter in Rural Residential, although not required, shall be M-6.18 and shall be constructed according to IDOT standards.
(b) On those streets for which the corporate authority of the Village has waived the curb and gutter requirement stated above, and the centerline profile of the street in question is a 3.5% slope or more, the minimum standard gutter shall be IDOT Type B, Standard 606201 as now exists or may be hereinafter adjusted from time to time.
(5) Shoulders. On streets not receiving curb and gutter, a minimum 5-foot shoulder should be installed. On streets where curb and gutter are being placed, the earth shoulder behind the curb shall be a minimum of 3 feet with a maximum slope of 4% deep.
(6) Ditches. Ditches shall be provided on both sides of the street for drainage of surface water where storm sewer is not provided. Side ditches shall be a minimum of 24 inches deep below the shoulder edge. Side slopes on each side of the drainage ditch shall be sloped at a rate of no more than 1 foot vertical to 3 feet horizontal. Paved ditches may be substituted at the direction and to the standards of the Village Engineer.
(7) Sidewalks.
(a) Sidewalks shall be installed on both sides of all Urban streets, except industrial streets in which sidewalks are required on 1 side of the street only. Sidewalks shall be 5 feet in width and 4 inches thick non-reinforced P.C. concrete conforming to IDOT Class 1 mix.
(b) The street edge of the sidewalk surface shall be located above the curb 1/4 inch for every foot horizontal from the curb and shall slope toward the street at a rate of 1/4 inch/foot.
(c) Ramps shall be installed at all intersections and at other locations required by the Village. Their location and design shall be according to the latest IDOT Standard for Curb Ramps Accessible to the Disabled.
(d) All sidewalks shall be offset from the property line by 1 foot horizontal to the nearest edge of the sidewalk.
(Am. Ord. 1998-19, passed 11-5-1998)
(8) Waiver. On those streets for which the Corporate Authority of the Village has waived the vertical curb requirements, as set forth in divisions (1) and (2) of this division (E), and the centerline profile of the residential street in question is a 3.5% slope or more, the minimum standard for a gutter shall be IDOT Type B Standard 1914, as now exists or may be hereinafter amended from time to time.
(Am. Ord. 1995-34, passed 6-20-1996)
(F) Street grades. The grade of major streets shall not exceed 5% unless necessitated by exceptional topography and approved by the Vllage Board of Trustees. The grade of all other streets shall not exceed 8%. The minimum grade of all streets shall be 0.4%. Pedestrian ways or crosswalks shall not exceed 12% grade unless steps of an approved design are to be constructed.
(G) Tangents. A tangent at least 100 feet in length shall be introduced between reverse curves on major arterials and collector streets.
(H) Cul-de-sacs. Dead-end streets, stub street.
(1) A cul-de-sac shall not be longer than 600 feet in residential subdivisions, measured from centerline of connecting street to radius point of cul-de-sac.
(2) The diameter of a cul-de-sac turnaround (measured at the outside right-of-way) shall be not less than 120 feet and shall be constructed to a minimum 45-foot radius to the back of curb.
(3) All dead-end streets or stub streets shall be improved to the limits of the subdivision plat and terminated by a barricade improvement recommended by the Village Engineer, approved by the Village Board of Trustees and installed by the developer at his or her own expense.
(Am. Ord. 1998-19, passed 11-5-1998)
(I) Half-streets. Street systems in new subdivisions shall be laid out so as to eliminate or avoid half-streets. Where a new subdivision abuts an existing street of inadequate right-of-way width, additional right-of-way width may be required to be dedicated by the subdivider to meet the requirements of this section.
(J) Street intersections.
(1) Streets shall be laid out so as to intersect as nearly as possible at right angles. A proposed intersection of 2 new streets at an angle of less than 70 degrees shall not be acceptable. Not more than 2 streets shall intersect at any 1 point unless specifically approved by the Village Board of Trustees.
(2) Proposed new intersections along 1 side of an existing street shall, wherever practicable, coincide with any existing intersections on the opposite side of the street. Street jogs with centerline offsets of less than 125 feet shall not be permitted, except where the intersected street has separated dual drives without median breaks at either intersection. Where streets intersect major streets, their alignment shall be continuous.
(3) Minimum curb radius shall be 25 feet for residential streets and 30 feet for collector streets. A minimum curb radius shall be based on an IDS for arterial streets. In any case where more dedication is deemed necessary to provide safe sight distance or for traffic channelization, the Plats Officer may specify a greater cutoff than the normal indicated above. Alley intersections and abrupt changes in alignment within a block shall have the corners cut off in accordance with standard engineering practice, to permit safe vehicular movement.
(4) Where the grade of any street at the approach of an intersection exceeds 7%, a leveling area shall be provided having not greater than 4% grade for a distance of 25 feet, measured from the nearest right-of-way line of intersecting street.
(5) Intersections shall be designed with a flat grade wherever practical. In no case shall the vertical alignment within the intersection area exceed 4%.
(6) Where any street intersection will involve earth banks or existing vegetation inside any lot corner that would create a traffic hazard by limiting visibility, the developer shall cut the ground and/or vegetation (including trees) in connection with the grading of the public right-of-way to the extent deemed necessary to provide an adequate sight distance.
(7) On those streets where the corporate authority of the Village has waived a vertical curb requirement as set forth in divisions (E)(1) and (E)(2) of this section, the radius returns at all intersections shall include a gutter that conforms with IDOT Type B Standard 1914 as that standard now exists or from time to time is amended, irregardless of the slope of the street.
(Ord. 1995-34, passed 6-20-1996; Am. Ord. 1998-19, passed 11-5-1998)
(K) Street names. All street names are to be approved by the Plats Officer and the post office prior to final map approval. No street names shall be used which will duplicate or be confused with the names of existing streets. New streets which are extensions of or obviously in alignment with existing streets shall bear the name of the existing streets.
(L) Alleys.
(1) Alleys shall be provided in all business, commercial, and industrial districts, unless the Village Board of Trustees waives this requirement where other definite and suitable provision is made for service access such as off-street loading and parking, consistent with and adequate for the uses proposed and in accordance with the provisions of the Village zoning ordinance.
(2) The width of alleys shall be not less than 24 feet.
(3) Dead-end alleys are prohibited except under very unusual circumstances and crooked and “T” alleys shall be discouraged. Where dead-end alleys are unavoidable, they shall be provided with adequate turnaround facilities at the dead-end.
(4) Alleys shall not be approved in residential areas.
(M) Storm sewers.
(1) Design flows.
(a) Stormwater flows shall be based on the Rational Formula, Q-CIA, where C is the coefficient of runoff, I is the rain intensity in inches per hour, and A is the area in acres.
(b) The storm sewer system shall be designed to carry a 10-year frequency flow, except in storm sewer runs receiving runoff from only local streets and adjacent lots which require a 5-year frequency design. All storm sewer pipe shall be a minimum of 12 inches in diameter.
(c) All sewers shall have a slope that will give a mean velocity, when flowing flow of not less than 3 fps based on Kuttes Formulary. Where velocities greater than 10.0 fps are attained, special provisions shall be made to protect against displacement, erosion, or shock.
(2) Inlet design. Inlets and pipes shall be located and sized so that conditions are met for a 5-year storm. Inlets shall be placed so that surface water is not carried across or around any intersection in the gutter. Streets shall have a minimum of one 9-foot lane in each direction free of stormwater flowing or ponding. Inlets shall be of a type approved by the Village Engineer with a minimum 4 by 4 inlet specified.
(3) Pipe standards. The type of material permitted for storm sewers shall be as specified in § 550 of the IDOT Standard Specifications.
(4) Manhole standards.
(a) Manholes shall be installed at the end of each line, at all changes in grade, size or alignment, or at distances not greater than 350 feet.
(b) The minimum diameter of manholes shall be 48 inches.
(5) Proper backfilling. Backfilling excavations shall be with a select fill material, as approved by the Village, placed in 6-inch layers, loose measurement, and compacted to not less than 95% of standard laboratory density.
(Ord. 1992-9, § 1001, passed 3-18-1993; Am. Ord. 1995-32, passed - -; Am. Ord. 1995-34, passed 6-20-1996; Am. Ord. 1998-10, passed 11-5-1998; Am. Ord. 2007-71, passed 12-20-2007
)