261.14—Use by over-snow vehicles.
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:
(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.