Free: Contests & Raffles.
The difference is on National forest lands any vehicle on a road must be street legal. Most ATV's are not street legal unless you have them licesed that way, and they have to have a horn and a rear view mirror. Mine is street legal and can be ridden on the roads.Remember, your truck is also street legal, but your quad is not. Some FS guys won't pay you any mind and some will fine you and confiscate your ATV.
....but i just hate it when im sweating my balls off and some Jack ass comes flying past me on a quad....