92 Ill. Adm. Code 442.410
Axles
Section 442
Section 442.410 Axles
a) Must meet federal chassis requirements as indicated on the
federal certification label as required by 49 CFR 567 (Certification) and 49
CFR 568 (Vehicles Manufactured in Two or More Stages).
b) Wheel base shall not be less than 123 inches.