Ill. Admin. Code tit. 92, § 3040.22
d) The following federal regulations may allow additional agricultural exceptions:
3) 49 CFR 173.6 pertaining to materials of trade.
(Recodified from 92 Ill. Adm. Code 171 (Department of Transportation) pursuant to P.A. 104-0025, at 49 Ill. Reg. 12517)