605 ILCS 5/8-107

No new highway or other public way shall be opened into or connect with or be carried over or under any freeway until and unless the Department, the county board, or the corporate authorities of any municipality, as the case may be, consents thereto in writing, and the Department, county board, or the corporate authorities of any municipality, as the case may be, may give or withhold their respective consent or fix such terms and conditions as will best subserve the public interest.