625 ILCS 5/1-133.1

(625 ILCS 5/1-133.1) (from Ch. 95 1/2, par. 1-133.1) Sec. 1-133.1. Interstate highway. Any highway which is now, or shall hereafter be, a part of the national system of interstate and defense highways within this State. (Source: P.A. 85-830.)