92 Ill. Adm. Code 442.260
Rub Rails
Section 442
Section 442.260 Rub Rails
a) There shall be one rub rail located approximately at seat
level which shall extend from the rear of the entrance door on both sides to a
point of curvature at the rear of the body.
b) Rub rails shall be constructed of 16-gauge longitudinally
corrugated or ribbed steel, ventilated, four inches minimum width, and securely
fastened to the body by bolts, rivets, or welding.