225 ILCS 440/3.16

"Scenic byway" means that portion of a highway that has been nominated by the Department to the United States Department of Transportation for designation as a national scenic byway or All-American Road, and that has received national designation. "Scenic byway" does not include a section of primary or Interstate highway that traverses a business area at the time of nomination, except in accordance with Section 14.02(a)(5).