I. No person shall operate a snowmobile on any portion of the Rockingham recreational trail west of Route 28 when it is not snow-covered.
II. No person shall use the parking lot at the Windham depot along the Rockingham recreational trail during the period from 1/2 hour after sunset to 1/2 hour before sunrise.
III. The department of natural and cultural resources shall provide sanitary facilities at the parking area in Windham along the Rockingham recreational trail when the trail is snow-covered.