36 C.F.R. § 261.54 National Forest System roads.
Title 36 - Parks, Forests, and Public Property
When provided by an order, the following are prohibited: (a) Using any type of vehicle prohibited by the order. (b) Use by any type of traffic prohibited by the order. (c) Using a road for commercial hauling without a permit or written authorization. (d) Operating a vehicle in violation of the speed, load, weight, height, length, width, or other limitations specified by the order. (e) Being on the road. (f) Operating a vehicle carelessly, recklessly, or without regard for the rights or safety of other persons or in a manner or at a speed that would endanger or be likely to endanger any person or property. [42 FR 2957, Jan. 14, 1977, as amended at 46 FR 33521, June 30, 1981]
Title 36: Parks, Forests, and Public Property
PART 261—PROHIBITIONS
Subpart B—Prohibitions in Areas Designated by Order
§ 261.54 National Forest System roads.

