It is prohibited to possess or operate an over-snow vehicle on National Forest System lands in violation of a restriction or prohibition established pursuant to 36 CFR part 212, subpart C, provided that the following uses are exempted from this section:

(a) Limited administrative use by the Forest Service;

(b) Use of any fire, military, emergency, or law enforcement vehicle for emergency purposes;

(c) Authorized use of any combat or combat support vehicle for national defense purposes;

(d) Law enforcement response to violations of law, including pursuit;

(e) Use by over-snow vehicles that is specifically authorized under a written authorization issued under Federal law or regulations; and

(f) Use of a road or trail that is authorized by a legally documented right-of-way held by a State, county, or other local public road authority.