225 ILCS 440/3.03
Current through Public Act 103-593
"Primary highway" means any highway, other than an Interstate highway, designated by the Department and approved by the United States Department of Transportation as a part of the Federal-Aid Primary System in existence on June 1, 1991 or any highway other than an Interstate highway that is not on such system that is on the National Highway System.
225 ILCS 440/3.03