I can't necessarily answer why but perhaps this will help someone else track the answer down. Chapter 171 (HB 716) of NH laws of the 1990 session took many of the standards then established as Dept of Safety rules and codified them into new sections RSA 270-D:1 - 270-D:9. Among them was the 150 ft rule. New question is why did the Dept of Safety make the rule that would later become law.
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