Whenever the load upon any vehicle extends to the rear 4 feet or more beyond the bed or body of the vehicle, there shall be displayed at the extreme rear end of the load, at the times specified in § 74.002, a red light or lantern plainly visible from a distance of at least 500 feet to the sides and rear. The red light or lantern required under this section shall be in addition to the red light required upon every vehicle. At any other time there shall be displayed at the extreme rear end of the load a red flag or cloth not less than 12 inches square.
(ILCS Ch. 625, Act 5, § 12-204) Penalty, see § 70.999