§ 155.045 STREET LAYOUT AND DESIGN.
   (A)   New and proposed street arrangements within a subdivision shall provide for the continuation of all existing streets into the area proposed to be subdivided unless topographical or other conditions make a continuance or conformance to existing streets impractical.
   (B)   New and proposed street arrangements within a subdivision shall allow for the future continuation of the street into adjacent tracts according to topographic conditions of the adjacent tracts and/or according to the consideration of future traffic circulation.
   (C)   Where a tract is subdivided into parcels larger than ordinary building lots, the parcels shall be arranged to allow the opening of future streets and further re-subdivision in a logical and orderly manner.
   (D)   All required streets shall conform to the table of minimum standards for street design and the materials and specifications on file with the Village Engineer.
   (E)   Minor streets shall be so laid out that their use by through traffic will be discouraged.
   (F)   Half streets shall be prohibited, except where:
      (1)   A dedicated half street exists adjacent to the parcel being subdivided; and (Under this condition, the other half shall be platted and approved according to the standards herein.)
      (2)   The Plan Council and Village Board determine that it will be practicable to require the dedication of a right-of-way on land not wholly owned by the developer. Under this condition, the village may take action as is required to secure the right-of-way and the applicant shall pay the costs as well as the costs of the required improvements.
   (G)   (1)   The maximum length of a cul-de-sac shall be 500 feet measured along the center line from the intersection at origin through center of circle to end of right-of-way.
      (2)   Each cul-de-sac shall have a terminus of nearly circular shape with a minimum diameter of at least 120 feet from the property line to property line.
      (3)   The minimum cul-de-sac right-of-way width shall be 60 feet and the minimum pavement width shall be 28 feet.
      (4)   The use of cul-de-sac streets shall be prohibited in multi-family, business or industrial districts.
   (H)   The following standards are established for the purpose of providing protection for individual properties and to provide for traffic safety and the efficient use of the primary street for its intended function of accommodating through traffic.
      (1)   A marginal access street may be required in commercial or industrial zones, separated from a primary street by a planting or grass strip having a minimum width of 20 feet between the pavement of the primary street and pavement of the marginal access street. Points of access from the frontage road to the primary street shall be spaced at a minimum of 1,320 feet.
      (2)   In residential areas, access to primary streets shall be provided by one of the following means:
         (a)   The subdivision of lots so as to back onto the primary street and front onto a local street; and/or (No access to individual lots shall be provided from the primary street and a landscaped screening, as approved by the Plan Council, shall be provided in a strip of land at least 12 feet wide along the rear property lines of the lots.)
         (b)   A marginal access street, separated from the primary street by a planting or grass strip having a minimum width of 15 feet between the pavement of the primary street and the pavement of the marginal access street. Points of access from the frontage road to the primary street shall be spaced at a minimum of 1,320 feet.
   (I)   It must be evidenced that all street intersections and confluences encourage safe traffic flow.
      (1)   The intersection of more than two streets at one point shall be avoided, except where otherwise impractical to secure a proper street system.
      (2)   Streets shall intersect one another at an angle as near to a right angle as possible and in no event shall the intersections be at angles of less than 60 degrees.
      (3)   The minimum curb radius at the intersection of two minor streets shall be 20 feet; at the intersection of a minor street and a collector street, the minimum curb radius shall be 30 feet and at the intersection of two collector streets, the minimum curb radius shall be 40 feet. All street corners along designated truck routes where the intersecting street leads directly to, from or is within property zoned for manufacturing purposes, shall have a minimum radius of 45 feet.
      (4)   Proposed new intersections along one side on 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 125 feet shall be prohibited.
      (5)   When connecting streets deflect from each other at any point by more than 30 degrees, they shall be connected by a curve with a radius adequate to insure a sight distance of not less than 200 feet and of a greater radii as the Plan Council shall determine for special cases.
   (J)   Where a subdivision borders an existing narrow road or when the official map and/or official plan 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 or her expense, the areas for widening or realignment according to the standards required by these regulations.
   (K)   Bridges of primary benefit to the applicant, as determined by the Plan Council, shall be constructed at full expense of the applicant without reimbursement from the village. The sharing expense for construction of bridges not of primary benefit to the applicant, as determined by the Plan Council, will be fixed by special agreement between the village and the applicant.
   (L)   (1)   General reference. It is intended that all public streets shall be constructed in accordance as far as applicable with the most recently adopted edition of the State of Illinois, Department of Transportation, “Standard Specifications for Road and Bridge Construction,” including current highway standards, special provisions and supplemental specifications as issued by the Department. These shall be referred to as the “state standard specifications” hereinafter.
      (2)   Subgrade. The subgrade of all public streets shall be prepared in accordance with Section 212 of the state standard specifications. It is required that the soil composing the subgrade have a minimum soil support value of “three” as determined by the IBR, Illinois Bearing Ratio. Test procedures used by the Illinois Department of Transportation. When, in the opinion of the Village Engineer, evaluation of the suitability of the subgrade to support the proposed pavement is warranted, a competent soils engineer contracted by the developer, at his or her expense and approved by the Village Engineer, shall perform the necessary soil tests to insure that a stable subgrade as specified is being provided.
      (3)   Design of pavement.
         (a)   Procedure.
            1.   The required thickness of the pavement shall be determined in accordance with the current Illinois Department of Transportation Manual of Instructions for the Structural Design of Bituminous Pavements on Projects involving MFT, FAS, FAUS and TOPICS Funds or Illinois Department of Transportation Design Manual, Section 7-100, Structural Design of Portland Cement Concrete Pavement.
            2.   The anticipated traffic volumes, the composition of the traffic and the subgrade support strength provided by the roadbed soils shall be considered in the design of the pavement. This information is subject to the review and approval of the village.
         (b)   Minimum design criteria. Not less than the minimum requirements listed below shall be permitted in the design of streets.
Street Classification
Minimum Structural Number
Street Classification
Minimum Structural Number
Primary or major street:
*ADT over 15,000
5.5
*ADT 7,000 - 15,000
5.0
*ADT under 7,000
4.0
Secondary or collector street
3.3
Minor or local street
2.7
Marginal access or frontage street
2.7
Cul-de-sac
2.7
Industrial park streets
3.5
NOTE TO TABLE:
*Average daily traffic anticipated ten years beyond completion of subdivision
 
         (c)   Minimum pavement thickness requirements. For Portland cement concrete pavements, no less than six inches in thickness will be allowed. For bituminous pavements, the minimum requirements for surface course, base course, and sub-base course shall be in compliance with those given in Table 2 of the aforesaid Manual of Instructions for the Structural Design of Bituminous Pavements on Projects Involving MFT, FAS, FADS and TOPICS FUNDS.
      (4)   Review of pavement design.
         (a)   The village shall be furnished with copies of the soils report when a soil support IBR value of three or greater is used in the pavement design, a list of proposed street classifications, the anticipated traffic volumes which will be generated and traffic factors based on preceding date.
         (b)   The Village Engineer shall review this design information and report the evolution of same to the Plan Council prior to its consideration of the engineering plans.
      (5)   State construction requirement for bituminous pavements. For subdivision streets, the installation of the final one and one-quarter inch of bituminous concrete surface of the proposed pavement shall be delayed for one winter. After May 1 of the year following the initial construction of the pavement, the contractor and the Village Engineer shall inspect and mark all distressed or damaged areas. These areas shall be removed and repaired to the satisfaction of the Village Engineer. The entire surface of the existing pavement shall then be cleaned; primed at a minimum rate of 0.05 gallons per square yard; sanded, if the street is open to traffic, at the minimum rate of two pounds per square yard; and surfaced with the final layer of bituminous concrete as required.
      (6)   Materials inspection.
         (a)   Subgrade compaction and all materials incorporated into the roadway section shall be tested by a competent quality assurance testing company. Tests shall be made in compliance with current state recommendations, except that plant inspectors will not be required in concrete or blacktop plants continuously during production. However, one random test shall be made daily on all material used by a competent quality assurance testing company. Results of all tests conducted shall be forwarded to the Village Engineer for his or her review and approval. Work will not be accepted without the test results submitted to the village.
         (b)   The owner shall provide a pavement core for every 1,000 square yards of pavement to determine the thickness, strength and/or density of the pavement, as requested by the Village Engineer, to determine their compliance with the contract specifications.
(1981 Code, § 22.301) (Ord. 88-15, passed 11-7-1988; Am. Ord. 14-28, passed 9-15-2014)