Slow Moving Vehicle Sign

When operating a slow moving farm vehicle, am I required to use the slow moving vehicle sign?

Yes. Farm tractors or self-propelled units of farm equipment designed to operate at speeds less than 25 miles per hour or normally operated at speeds no more than 25 miles per hour must display a triangular slow-moving vehicle emblem on the rear of the vehicle when traveling on a public highway regardless of the time of day or night. (Va. Code § 46.2-1081)