65 ILCS 5/11-80-11
The corporate authorities of each municipality may provide for and regulate cross-walks, curbs, and gutters. However, after the effective date of this amendatory Act of 1973, all new curbs which are provided for by any municipality, and all existing curbs which are a part of any reconstruction, within any block which is contiguous to any highway and in which more than 50% of the territory is devoted to or zoned for business, commercial or industrial use shall comply with this Section. In order to enable persons using wheelchairs to travel freely and without assistance, at each cross-walk a ramp with non-slip surface shall be built into the curb so that the sidewalk and street blend to a common level. Such ramp shall conform to the standards adopted by the Capital Development Board in accordance with the Environmental Barriers Act. Where because of surrounding buildings or other restrictions it is impossible to conform the slope with this requirement, the ramp shall contain a slope with as shallow a rise as possible under the circumstances. In all ramps there shall be a gradual rounding at the bottom of the slope.
65 ILCS 5/11-80-11