A motor vehicle use map, or MVUM, is the Forest Service document that tells you which roads and trails you are legally allowed to drive on a given national forest, which class of vehicle may use each one, and which months that permission applies. If a route is not on the map, you may not drive it, even if it is graded, signed, and shown in your navigation app. That single fact is the reason this map matters more than any other map in the truck.
What the map legally is
The requirement is short. 36 CFR 212.56 states: “Designated roads, trails, and areas shall be identified on a motor vehicle use map. Motor vehicle use maps shall be made available to the public at the headquarters of corresponding administrative units and Ranger Districts of the National Forest System and, as soon as practicable, on the website of corresponding administrative units and Ranger Districts. The motor vehicle use maps shall specify the classes of vehicles and, if appropriate, the times of year for which use is designated.”
That comes out of the 2005 Travel Management Rule, which set up the whole system. The final rule, published November 9, 2005, states that motor vehicle use maps “will be available at local Forest Service offices and, as soon as practicable, on Forest Service web sites,” and that the prohibitions cover “use of motor vehicles off the designated system, as well as use of motor vehicles on routes and in areas that is not consistent with the designations.”
The enforcement half sits in a different part of the code. 36 CFR 261.13 makes it prohibited “to possess or operate a motor vehicle on National Forest System lands in that administrative unit or Ranger District other than in accordance with those designations,” with exemptions for things like aircraft, watercraft, emergency vehicles, and use specifically authorized in writing. Under 36 CFR 261.1b, violating a Part 261 prohibition is punishable by a fine of not more than $500 or imprisonment for not more than six months or both.
The three questions the map answers
Every MVUM is answering the same three questions for every route on it. Read it in that order and it gets much simpler.
Is this route designated at all? Designation is per route, and the map shows only routes designated for public motor vehicle use. Absence is not an oversight, it is the answer.
Which vehicles? 36 CFR 212.51(a) requires that motor vehicle use “shall be designated by vehicle class.” A road can be designated for highway-legal vehicles only, or open to a narrower class such as vehicles under a certain width, or open to motorcycles and nothing else. Your MVUM’s legend defines the classes it uses. Read the legend on your specific map rather than assuming the symbols mean the same thing they meant on the last forest.
When? The same section adds “and, if appropriate, by time of year.” Seasonal designations are common on routes that turn to mud or cross winter range. A road open in August is not automatically open in April, and the seasonal dates appear on the map, not on a sign in the woods.
Absence means closed, and that is the part people get wrong
The mental model most people arrive with is that a road is open unless something says otherwise. Under the Travel Management Rule, national forest roads work the other way. The designated system is the permission, and everything else is closed to motor vehicles by default.
This is where paper forest visitor maps, older atlases, and phone navigation cause trouble. Those show roads that exist. The MVUM shows roads you may drive. The two overlap heavily and disagree in exactly the places that get people cited: two-tracks to old landings, spurs to a favorite spot, and shortcuts that were legal a decade ago.
BLM land runs on the same principle with different paperwork. BLM’s camping page, verified July 2026, states that vehicles must stay on designated roads and trails unless the area is specifically designated for off-road vehicle use. Different agency, same instinct: the route has to be designated.
The dispersed camping corridor
If you camp out of a vehicle, this is the paragraph that matters most. 36 CFR 212.51(b) says the responsible official “may include in the designation the limited use of motor vehicles within a specified distance of certain forest roads or trails where motor vehicle use is allowed, and if appropriate within specified time periods, solely for the purposes of dispersed camping or retrieval of a downed big game animal by an individual who has legally taken that animal.”
Read that carefully, because two words do most of the work. “May” means the corridor is optional. A forest can designate zero camping corridors and still be fully compliant. “Specified distance” means the number is local. Some forests publish a corridor along certain roads and some do not, and where they do, the distance and the list of eligible roads appear on the MVUM or in the accompanying forest order.
We are not going to print a national corridor distance, because there is not one. Anyone quoting you a single figure that works everywhere is guessing. Get the number off the map for the forest you are on, and if the map does not grant a corridor, park in an existing pullout on the designated route. More on the legal ground rules in our dispersed camping guide.
What the MVUM will not tell you
It is a legal document, not a trip planner, and it is honestly not much fun to read. Expect to work for it.
The map tells you a route is designated. It does not tell you the road is passable, that a culvert has not washed out, how steep the grade is, or whether a 30-foot trailer can turn around at the end. It does not tell you about private inholdings that a designated route crosses. And it does not always reflect a temporary closure: a forest order can gate a route that your edition of the map still shows as open, which is one more reason the sign and the gate win over the paper.
Editions change, and the edition date is printed on the map. We have not verified a national update schedule, so download a fresh copy from the forest’s website before a trip rather than trusting last year’s file.
App overlays that display MVUM data are genuinely useful for knowing which spur you are sitting at. They are also a copy. If the app and the current official MVUM disagree, the official map is the one a law enforcement officer is working from.
The short version
Download the MVUM for the specific forest, check the route number against the map before you turn, check your vehicle class, check the season dates, and treat any road missing from the map as closed. Then read the sign at the junction, because a current forest order beats every map in this article. If you are picking a forest to start with, our national forests pages and the find your own spot guide cover how to narrow it down before you are standing at a junction with no signal.