If you don't have tags and insurance it's not technically allowed as almost all the trails are public co roads of fire service roads
This is direct from the gov site for gwnf here is the link but I copied the info you need
http://www.fs.usda.gov/detail/gwj/maps- ... ev3_000547The MVUM is a requirement of the Travel Management Final Rule and reflects travel management decisions on each forest. The MVUM displays National Forest System (NFS) routes (roads and trails) or areas designated open to motorized travel. The MVUM also displays allowed uses by vehicle class (highway-legal vehicles, vehicles less than 50 inches wide and motorcycles), seasonal allowances and provides information on other travel rules and regulations. Routes not shown on the MVUM are not open to public motor vehicle travel. Routes designated for motorized use may not always be signed on the ground but will be identified on the MVUM. It will be the public’s responsibility to reference the MVUM to determine designated routes for motor vehicle use.
The MVUM will be updated to correct mapping errors or discrepancies and update travel decisions. The next update will be in January 2009 and occur annually thereafter.
The MVUM is a black and white map with no topographic features. It is not a stand alone map and is best used in conjunction with a Forest Visitor Map or other topographic map. The MVUM is free to the public at each local Ranger District office and at the Roanoke Supervisor’s Office. The MVUM is available on this website and may be printed from your home computer.