43 CFR §423.40

1. (a)When operating a vehicle on Reclamation lands and Reclamation projects, you must comply with applicable Federal, State, and local laws, and with posted restrictions and regulations. Operating any vehicle through, around, or beyond a restrictive sign, recognizable barricade, fence, or traffic control barricade, is prohibited.
2. (b)You must not park a vehicle in violation of posted restrictions and regulations, or in a manner that would obstruct or impede normal or emergency traffic movement or the parking of other vehicles, create a safety hazard, or endanger any person, property, or natural feature. Vehicles so parked are subject to removal and impoundment at the owner's expense.
3. (c)You must not operate any vehicle, or allow another person to operate a vehicle in your control, in a careless, negligent or reckless manner that would endanger any person, property, natural resource, or cultural resource.
4. (d)In addition to the regulations in this part, the regulations governing off-road-vehicle use in 43 CFR part 420 apply.