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(A) When required. Alleys must be provided in all commercial and industrial zoning districts except that the Chief Subdivision Engineer may waive this requirement where another definite and assured provision is made for service access, such as off-street loading and parking consistent with, and adequate for, the uses proposed. Alleys are allowed in residential zoning districts.
(B) Dead-end alleys. Dead-end alleys are prohibited.
(C) Design and construction.
(1) Alleys serving commercial and industrial development must be at least 24 feet in width.
(2) Alleys serving residential development must be at least 20 feet in width.
(3) Alleys must be constructed in accordance with the pavement material and construction standards that apply to local streets. See § 154.139.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
(A) Half streets are prohibited, except where essential to the reasonable development of the subdivision in conformity with other requirements of these regulations, and where the Chief Subdivision Engineer finds it will be practicable to require the dedication of the other half when the adjoining property is developed.
(B) A minimum right-of-way width of 50 feet and a minimum pavement width of 20 feet is required for any authorized half street.
(C) Wherever a half street is adjacent to a tract to be subdivided, the other half of the street must be platted and constructed within the developing tract.
(D) In cases where half streets are allowed, the subdivider must grade and improve the half street, the same as all other subdivision streets.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
(A) Cul-de-sacs may not exceed 1,200 feet in length, measured along the center line. The County Board may approve a longer cul-de-sac length in low-density subdivisions where no more than 15 lots will take access from the cul-de-sac street. See the figure below.
(B) The closed (bulb) end of a cul-de-sac street must have a minimum diameter of 130 feet. See the figure below.
(C) Cul-de-sac pavement width must comply with local street standards. The pavement at the closed (bulb) end must be at least 100 feet in diameter measured from back-of-curb to back-of-curb in urban subdivisions and edge of pavement to edge of pavement in rural subdivisions. Landscaping within the middle of the cul-de-sac bulb is encouraged except when prohibited by the Road District Commissioner. See the figure below.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
Temporary T-turnarounds may be required at the end of streets that are intended for extension when a subsequent phase of subdivision is developed or when the abutting parcel is developed. The terminus of a T-turnaround must comply with the following minimum standards.
(A) The T must be at right angles to the main street.
(B) Each wing of the T must be at least 20 feet long, plus one-half the main street pavement width, measured from the center of the right-of-way. See the figure below.
(C) The right-of-way width must be at least as wide as the main street’s right-of-way.
(D) At the time that a street is connected or extended, temporary T-turnarounds must be removed by the road authority or by the developer proposing the connection or extension.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
(A) Major streets.
(1) Right-of-way. The minimum right- of-way width of a major street is 150 feet, unless the Chief Subdivision Engineer or road authority requires a greater right-of-way width.
(2) Pavement. The Chief Subdivision Engineer or road authority is authorized to establish minimum pavement widths and design standards for major streets.
(B) Secondary streets.
(1) Right-of-way. The minimum right- of-way width of a secondary street is 120 feet.
(2) Pavement. The Chief Subdivision Engineer or road authority is authorized to establish minimum pavement widths and design standards for secondary streets.
(C) Collector streets.
(1) Right-of-way. The minimum right- of-way width of a collector street is 80 feet.
(2) Pavement. The minimum pavement width of a collector street or any street serving industrial or commercial development is 36 feet (excluding curb and gutter).
(D) Local streets.
(1) Right-of-way. The minimum right- of-way width of a local street is 66 feet.
(2) Pavement. The minimum pavement width of a local street in a subdivision with open drainage is 24 feet. The minimum pavement width for subdivisions with curb and gutter is 28 feet (excluding curb and gutter).
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
(A) Concrete curb and gutter must be provided along the outside edge of all street pavements in all nonresidential subdivisions and in all residential subdivisions where the average lot width at the front lot line is less than 120 feet; and/or where the degree of slope exceeds 5%.
(B) Curb and gutter must be Type B-6.12, in accordance with State Department of Transportation (IDOT) highway standards or standards acceptable to the appropriate Road District Commissioner. See the figure below.
(C) The back of curbs must be depressed or cut in accordance with IDOT standards, subject to the approval of the Chief Subdivision Engineer when the final location for access to the public roadway for driveways, sidewalks and other paths is determined.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
(A) All existing public and/or dedicated streets abutting a subdivision must be improved to a standard established by the highway authority for the subject street.
(B) If the property abutting a county highway is to be subdivided or access is being requested to a county highway, the developer/owner must dedicate, at no cost to the county, sufficient land area to satisfy the county road’s right-of-way requirement, including corner clips required by the County Highway Department and/or applicable highway authorities.
(Ord. passed 7-8-1970; Res. 09-167, passed 6-18-2009)
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