All farm machinery and implements of husbandry including all road construction and maintenance machinery designed to operate at 25 miles per hour or less, traveling on a public highway day or night shall display, on the rear of the vehicle, a slow-moving vehicle reflective emblem as specified in subsection (a) of the act. The emblem shall be positioned as near as practicable to the center of the machinery.
67 Pa. Code § 165.3