The following specifications for the design, grading and surfacing of new and existing streets shall be adhered to.
(A) Design.
(1) Grades of streets. The maximum grades for collector and larger streets shall not exceed 6%. The maximum grades for other streets shall not exceed 8%. In no case shall the grade of any street be less than 0.3%.
(2) Vertical curvature. Vertical curves shall be provided at all changes in street grade. Length of vertical curves shall be determined by good engineering judgment. In no case shall the vertical curve at a street intersection be less than 50 feet.
(3) Horizontal curvature.
(a) The minimum radius of centerline horizontal curvature shall be as follows:
Arterial streets | 500 feet |
Collector streets | 300 feet |
Other streets | 100 feet |
(b) Angles on the centerline of a street are not permitted.
(4) Stopping sight distance. Stopping sight distance shall be based on a line of sight, one end of which is four and one-half feet above the pavement and the other end four inches above the pavement. In flat topography sight distance of not less than 400 feet is desirable. In rolling topography sight distance shall be not less than 200 feet.
(5) Width. Arterial street width shall be as determined by the Plan Commission. Collector streets shall be constructed with a 36-foot width from back to back of the curb. All other streets shall be 30 feet in width from face of curb to face of curb.
(B) Grading. All excavations, embankment and subgrading work shall conform to the Standard Specifications for Road and Bridge Construction. In general, backslopes of all ditches on street rights-of-way shall be as flat as topography will permit. In no instance shall the backslopes of cut sections or ditches be less than two to one (two horizontal to one vertical).
(C) Construction. The following types of construction shall be the minimum permitted.
(1) (a) Base construction for residential streets exclusive of collector streets shall be aggregate base course, type A or B, with a minimum compacted thickness of nine inches.
(b) Base construction for collector streets in residential areas shall be bituminous aggregate mixture base course, Marshall stability 1,700, with a minimum compacted thickness of six inches.
(c) Base construction for streets in commercial and industrial areas shall be bituminous aggregate mixture base course, Marshall stability 1,700, with a minimum compacted thickness of eight inches.
(2) All streets shall be provided with a two course bituminous surface consisting of bituminous concrete binder and surface courses, Class 1, each course having an average minimum compacted thickness of one and one-half inches.
(3) The final course (surface course) shall not be constructed until written permission from the President and the Board of Trustees has been granted.
(4) Binder and surface course mixes shall be State Department of Transportation Class 1, unless otherwise approved by the Board of Trustees.
(5) The developer may petition for and be granted final acceptance of the streets prior to completion of the final course. In this event he or she will be required to place in escrow with the village an amount sufficient, as determined by the Village Engineer, to cover the cost of the final surfacing course. The village shall then contract to have this work done at such time as it deems necessary.
(D) Curbs and gutters. Combination concrete curb and gutter shall be constructed along the outside edges of all street pavements of the type and thickness designated by the Village Engineer.
(E) Sidewalks. Sidewalks in residential areas shall be located one foot inside the right-of-way line, and shall be not less than five feet wide and five inches thick. The sidewalk shall be constructed with ready mix concrete that is locally known as a six bag mix, air entrained, placed atop a two inch cushion of CA-6 aggregate, properly compacted by mechanical method. The width, thickness and location of sidewalks in nonresidential areas shall be subject to the approval of the Plan Commission.
(F) Erosion control. All roadway ditches and slopes and all other slopes subject to erosion by runoff waters shall be properly protected by riprap, sod, seeding with rapid-growing grass or vegetation, and ditch checks. All the work shall conform to the applicable provisions of the Standard Specifications for Road and Bridge Construction, State of Illinois.
(2000 Code, § 155.081) (Ord. 876, passed 8-4-1975) Penalty, see § 154.999