55 ILCS 5/5-14004
The members of the regional planning commission may be compensated on a per diem basis with a mileage allowance for travel. The county board shall determine the amount of compensation by ordinance, however such compensation shall not exceed the compensation paid to members of the county board for per diem and mileage expenses. Except as hereinafter provided, all plans of the region made by such commission shall be advisory only, unless such plan or portion of it may affect any city, village or incorporated town in which there is a planning commission, and in case such regional plan for such city, village or incorporated town is adopted by the city, village or incorporated town planning commission, such regional plan or such part of which as may be adopted shall have such force and effect as by law may be provided; provided in counties of less than 500,000 inhabitants that, if such plan sets out the centerline location and right-of-way width of planned major streets in unsubdivided land or if such plan sets out the future location of planned major streets in unsubdivided land, the county board, upon adoption of such plan or part thereof by such regional planning commission, may by resolution of record forbid the construction of buildings in the right-of-way of such planned streets.
55 ILCS 5/5-14004