The driver of any vehicle other than one on official business shall not follow any fire apparatus traveling in response to a fire alarm closer than 500 feet or drive into or park such vehicle within the block where fire apparatus has stopped in answer to a fire alarm.
N.H. Rev. Stat. Ann. § 265:100
Following Fire Apparatus Prohibited
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.