New Hampshire Code of Administrative Rules
Res - Commissioner, Department of Resources and Economic Development
Chapter Res 8500 - BUREAU TRAIL USE RULES
Part Res 8503 - ALL BUREAU SNOWMOBILE TRAILS
Section Res 8503.02 - Snowmobile Trail Restrictions

(a) No person shall operate an OHRV other than an ATV, UTV, trail bike or snowmobile on snowmobile trails;

(b) No person shall operate a conventional motor vehicle on snowmobile trails;

(c) No person shall operate an ATV, UTV or trail bike on snowmobile trails unless posted as a permitted use. Trail restrictions shall be accomplished by posting signs that spell out the prohibited use, by public notification by authorized DRED personnel, or both, as appropriate; and

(d) No person shall operate an OHRV or snowmobile on plowed roads unless otherwise posted.