d85b2f49_Segway_laws__New_Hampshire_bicycle_law
[New Hampshire EPAMD law] and, if the EPAMD is operated between 1/2 hour after sunset and 1/2 hour before sunrise, a lamp emitting a white light which, while the EPAMD is in motion, sufficiently illuminates the area in front of the operator. [Comments] A headlamp is essential for visibility even in areas with overhead lighting where the headlight is not needed for illumination. The Segway law sets no standard for the distance at which the headlamp must be visible. The bicycle law sets a standard for visibility, and none for illumination, but the need for illumination is self-enforcing. The Segway's tilting forward and backward would have to be compensated in order for a headlight to maintain constant aim. No mechanism has been provided to accomplish this. As the Segway's tilting does not follow the slope, such a mechanism would require a slope sensor. [New Hampshire bicycle law] 
266:86 Headlamp Required at Night.  Every bicycle operated upon any way during darkness shall be equipped with a lamp emitting a white light visible from a distance of 300 feet in front of the bicycle...
Segway laws
New Hampshire bicycle law