These vehicles must be equipped with an illuminated rotating, oscillating, or flashing amber light or lights, or a flashing amber strobe light or lights, mounted on the top of the cab and of sufficient intensity to be visible at 500 feet in normal sunlight. If the load on the transport vehicle blocks the visibility of the amber lighting from the rear of the vehicle, the vehicle must also be equipped with an illuminated rotating, oscillating, or flashing amber light or lights, or a flashing amber strobe light or lights, mounted on the rear of the load and of sufficient intensity to be visible at 500 feet in normal sunlight.
625 ILCS 5/15-101