36 CFR § 261.54 - National Forest System roads.
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.
The following state regulations pages link to this page.