Every animal-drawn vehicle, farm tractor, implement of husbandry, and special mobile equipment, except when used for road construction or maintenance 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, when operated on a highway during a time when lighted lamps are required by § 74.002, shall display to the rear at least one flashing amber signal lamp mounted as high as practicable and of sufficient intensity to be visible for a distance of at least 500 feet in normal sunlight; provided that only the rearmost vehicle of a combination of vehicles coupled together need display the lamp.
(ILCS Ch. 625, Act 5, § 12-205.1) Penalty, see § 70.999