520 CMR, § 13.13
Applicants who have a minimum of two cumulative years of full time carriage horse driving experience without incident and have not been previously found in violation of any rules or regulations of any locality within which they operated shall be exempted from 520 CMR 13.04(1) through (3). Such person shall submit to the Commissioner sworn documentation together with application for Certificate of Competency to be a carriage horse Driver and $50 fee attesting to this experience. Documentation shall include letters of recommendation as to the skill and knowledge of the applicant pertaining to: driving a horse and carriage; and, public safety rules of the road for the Commonwealth of Massachusetts. Such documentation shall come from the employer(s) for whom said Driver worked or from professional driving club judges or officials. If self-employed, such documentation shall come from the city officials to whom the self-employed Driver reported in the city(s) which hosted the carriage horse operation or professional driving club judges or officials. Such documentation shall cover the full two years experience.
520 CMR, § 13.13