605 ILCS 5/3-103
The Department is authorized and instructed to enter into all agreements with the designated authority of the United States Government relating to the selection, construction and maintenance of highways under the provisions of the Federal Aid Road Act, to submit such scheme or project of selection, construction and maintenance as may be required by the designated authority of the United States Government, and to do all things necessary fully to carry out and make effective the cooperation contemplated and provided for by such Act.
In locating and constructing a highway which will be a part of the National System of Interstate and Defense Highways local needs, to the extent practicable, suitable and feasible, shall be given equal consideration with the needs of interstate commerce, so that such highway will not unduly discommode or interfere with local traffic or will not destroy reasonable access to schools, churches, markets, trade or community centers.
605 ILCS 5/3-103