To answer some of the comments from above, to be a legal road, it MUST appear on the black and white Motor Vehicle Use Map of the Coconino NF, or it's equivalent on the Avenza app which I referenced earlier. These maps are free, and are issued and updated yearly.
The presence of other tire tracks, or the presence of a USFS sign giving it a number mean nothing. Some major roads have been left off the map, and are now illegal. Other, remote, obscure two-tracks are legal. If it is not on the map as a designated legal route, you should not be on it in any motorized capacity. These designations are routinely ignored... like all the time by regular folks. Sometimes they are ignored intentionally, usually through ignorance. However, the law is the law.
These rules differ between different FS entities, but are fairly consistent in the Coconino, Prescott, and Kaibab NF's. You could probably travel and camp wherever you want, and never be caught. The entire Coconino NF has only 2 LEO's, 1 for Prescott, any one for the entire north and south Kaibab. Chances are slim that any LEO would be there at the same time as our group. But, while to have a group camp on an illegal road is bad (and I am guilty here too) to do so during a high to extreme fire risk season is foolish and irresponsible.
AZ Game and Fish rangers often ignore the FS rules (state vs Fed pissing contest). All the other roads on this route (except 9011R), are legal and open for business. But many, many roads that you encounter in the forest (I estimate 60%) are no longer legal routes. This is a departure from what many of you are accustomed to in the Tonto NF, and BLM land.
FWIW, I can appreciate the rules in some areas, but largely feel that they are way, way too restrictive. I even went to several meetings, and wrote letters when the Travel Management Plan and the subsequent MVUM were in the works about 10 years ago.