4.__Unlawfully operating snowmobile on plowed road.__A person may not operate a snowmobile upon any plowed private road, or public road plowed privately without public compensation, after having been forbidden to do so by the owner thereof, the owner's agent or a municipal official, either personally or by appropriate notices posted conspicuously on that road.

A.__A person who violates this subsection commits a civil violation for which a fine of not less than $100 nor more than $500 may be adjudged.

B.__A person who violates this subsection after having been adjudicated as having committed 3 or more civil violations under this Part within the previous 5-year period commits a Class E crime.

5.__Operating snowmobile on public way.__Except as provided in subsection 4 and this subsection, a person may not operate a snowmobile upon the main traveled portion, the sidewalks or the plowed snowbanks of a public way.

A.__A properly registered snowmobile may be operated on a public way only the distance necessary, but in no case to exceed 300 yards, on the extreme right of the traveled way for the purpose of crossing, as directly as possible, a public way, sidewalk or culvert.

B.__A properly registered snowmobile may be operated on a public way only the distance necessary, but in no case to exceed 500 yards, on the extreme right of the traveled way for the sole purpose of crossing, as directly as possible, a bridge, overpass or underpass, provided that that operation can be made in safety and that it does not interfere with vehicular traffic approaching from either direction on the public way.

C.__A snowmobile may be operated on any portion of a public way when the public way has been closed in accordance with Title 23, section 2953.

D.__If the main traveled portion of a public way is publicly plowed and utilized by conventional motor vehicles, a snowmobile may be operated only on that portion of the way not maintained or utilized for the operation of conventional