No person shall turn a vehicle or move right or left upon a roadway unless and until such movement can be made with reasonable safety. No person shall turn a vehicle or move right or left upon a roadway without giving an appropriate signal in a manner hereinafter provided.
N.H. Rev. Stat. Ann. § 265:44
Moving a Vehicle
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.