605 ILCS 5/9-132: Highway design.

A unit of local government may consult a highway design publication outside the Department's Bureau of Local Roads and Streets Manual for the construction of any highway in ownership or control of the unit of local government, except for a highway that is part of the National System of Interstate and Defense Highways, if:

(1) the unit of local government receives federal or State funds for the construction project;

(2) the highway design publication is approved by the Federal Highway Administration;

(3) the highway design publication is adopted by the unit of local government; and

(4) the design complies with all other applicable federal laws.