West Virginia Code Chapter 17C. Traffic Regulations and Laws of the Road § 17C-6-9. Slow-moving vehicle emblem

(a) All farm machinery and other machinery including all road construction machinery except when guarded by flagmen or flares, designed to operate at twenty-five miles per hour or less, traveling on a public highway during day or night shall display a triangular slow-moving emblem on the rear of the vehicle.

(b) The commissioner shall adopt standards and specifications for design and the position of mounting the slow-moving vehicle emblem, as well as requirements for certification of conformance. The requirements of such emblem shall be in addition to any lighting devices required by law.

(c) The use of this emblem shall be restricted to the use specified in subsection (a) and its use on any other type of vehicle or as a clearance marker on wide machinery or on stationary objects on the highway is prohibited.