Farm vehicles registered under RSA 261, self-propelled combines, self-propelled corn and hay harvesting machines and tractors used exclusively for agricultural purposes are exempt from the provisions of this subdivision.
N.H. Rev. Stat. Ann. § 266:53
Farm Vehicle Exemptions
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.