(A) Every animal-drawn vehicle, farm tractor, implement of husbandry, and special mobile equipment, when operated on a highway, must display a slow-moving vehicle emblem mounted on the rear, except as provided in division (B). Special mobile equipment is exempt when operated within the limits of a construction or maintenance project where traffic-control devices are used in compliance with the applicable provisions of the manual and specifications adopted under ILCS Ch. 625, Act 5, § 11-301.
(B) Every vehicle or unit described in division (A), when operated in combination on a highway, must display a slow-moving vehicle emblem as follows:
(1) Where the towed unit or any load thereon partially or totally obscures the slow-moving vehicle emblem on the towing unit, the towed unit shall be equipped with a slow-moving vehicle emblem. In those cases, the towing unit need not display the emblem.
(2) Where the slow-moving vehicle emblem on the towing unit is not obscured by the towed unit or its load, then either or both may be equipped with the required emblem, but it shall be sufficient if either displays it.
(3) A registered truck towed behind a farm tractor in conformity with the provisions of § 71.060 must display a slow-moving vehicle emblem in the manner provided in division (C) while being towed on a highway if the emblem on the towing vehicle is partially or totally obscured.
(C) The slow-moving vehicle emblem required by divisions (A) and (B) must meet or exceed the specifications and mounting requirements established by the department. The specifications and mounting requirements shall, on and before August 31, 2004, be based on the specifications adopted by the American Society of Agricultural Engineers and published by that body as ASAE § 276.2 dated March, 1968, or as ASAE § 276.5. On and after September 1, 2004, the specifications and mounting requirements shall be based on the specifications adopted by the American Society of Agricultural Engineers and published by that body as ASEA § 276.5 NOV 97. No advertising or other marking shall appear upon the emblem.
(D) A slow-moving vehicle emblem is intended as a safety identification device, and shall not be displayed on any vehicle nor displayed in any manner other than as described in divisions (A), (B), and (C).
(ILCS Ch. 625, Act 5, § 12-709) Penalty, see § 70.999