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

8.__Crossing a closed bridge, culvert, overpass or underpass with snowmobile.__A person may not cross with a snowmobile a bridge, culvert, overpass or underpass closed to snowmobiles by the Commissioner of Transportation.

A.__The Commissioner of Transportation may, following a public hearing, prohibit the crossing of an individual bridge, culvert, overpass or underpass if the commissioner determines that that crossing or use of the public way is hazardous.

B.__Any bridge, culvert, overpass or underpass closed by the Commissioner of Transportation must be posted by appropriate notices.

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

9.__Reckless operation of snowmobile.__A person may not operate a snowmobile in such a way as to recklessly create a substantial risk of serious bodily injury to another person.__ Violation of this subsection is a Class D crime.

10.__Operating snowmobile to endanger.__A person may not operate a snowmobile so as to endanger any person or property by:

A.__Operating the snowmobile on the statewide snowmobile trail system or a public right-of-way that is open to snowmobiling except at a reasonable and prudent speed for the existing conditions, including when approaching and crossing an intersection or railway grade crossing, when approaching and taking a curve, when approaching a hill crest, when traveling upon any narrow or winding trail and when a special hazard exists with respect to pedestrians, skiers or other traffic by reason of weather or trail conditions; or

B.__Operating the snowmobile in a manner that fails to control its speed at all times as necessary to avoid