(625 ILCS 5/1-187) (from Ch. 95 1/2, par. 1-187)
Sec. 1-187. Semitrailer.
Every vehicle without motive power, other than a pole trailer, designed for carrying persons or property and for being drawn by a motor vehicle and so constructed that some part of its weight and that of its load rests upon or is carried by another vehicle.
(Source: P.A. 76-1586.)