Hope I can help out a little. Here in Colorado we are about to rap up the process of reinstating the Roadless Rule. We had a different opportunity here than other states. Our governor and the state legislature formed a task force to examine the 2001 rule and, with public input, recommend changes to the rule to better serve Colorado and it's mtn. communities.
I have been very involved with our club to help our land use coordinator keep our club informed about the process. I have attended several meetings and have done a LOT of research on the 2001 rule and the reinstatement process.
1st a little history is in order. Back in 1964 Congress passed the Wilderness Act. The act mandated that public land managers inventory all public lands and identify all lands suitable for wilderness status. In typical government fashion it took longer than expected and involved many law suits. So they did it again in the early 70's. The inventory was called RARE I. Again the same old BS and they did it again ending in 1979 and was called RARE II. You will hear these terms thrown around a lot. Fast forward to 1998, Forest Chief Mike Dombeck realized that the USFS had a backlog of maintenance on existing roads so he put a temporary ban on road construction in Inventoried Roadless Areas (IRA) and adjacent primitive areas. He also gave notice to his bosses (the Sec. Of Agriculture and the Pres) that the USFS was proposing a rule change to make the ban permanent. During the public comment period on the proposed change the USFS received a record number of comments, the overwhelming majority were in favor of making the changes permanent. In 2001 Pres. Clinton made the changes permanent. After Bush was elected, and there was a changing of the guard, several states filed suit in federal court to repeal the 2001 rule. IIRC there were 9 cases and all upheld the rule. In late 2004 or early 2005 Bush suspended the rule and set forth a process in which the governor of each state can petition the Sec of Agriculture on how best to proceed with the rule in their state. Most states have petitioned to reinstate the rule. CA, OR and NM have decided to let a federal court decide after hearing from all sides. Other states have filed paper work saying the will abide by the decision in the CA et-al case even though they are not directly involved in the case.
OK a little background that I hope will answer a few questions and dispel some of the rhetoric you will hear.
What is the Inventoried Roadless Area (IRA) process? Well basically it's an inventory. Like a shop keeper keeps inventory of this stock, the USFS keeps an inventory of lands that have primitive characteristics. Much like a shopkeeper's, the USFS's inventory is dynamic and land is added and deleted during FS plan revisions. The inventory exists as a set of lines on a map enshrined somewhere in Washington DC.
How does an area get included in the inventory? An IRA has to be at least 5,000 acres or adjacent to an existing Wilderness Area. The IRA has to be relatively free from human impact and have mostly a primitive characteristic.
Why are there ROADS in a ROADLESSarea? This one is going to be difficult as I am a visual person and it will be difficult to explain in writing. Give me a white board and 20mins of your time and I guarantee you will have an AH-HA moment. Any way here it goes so bear with me.
Let's say you have a forest, it is >5,000 acres and is mostly free of impact. However ********** dab in the middle of it there is an abandon mine and leading to the mine is a FS road. You look on a forest service map and it says that this forest is an IRA.

When the USFS does the inventory they first look at the overall characteristic of the area and if there are some roads in the area they create a buffer zone around the road. The zone is 300 feet wide (150 feet either side of the road). Then, if say the road switchbacks up a hill instead of making the buffer zig-zag up the hill, leaving little slivers of land between the switchbacks, they "round" or "smooth" the edges so the buffer includes the switchback and all the ground in between. With me so far? Next they will create a buffer zone around the mine. All the acreage with in the buffer zone is subtracted from the overall acreage of the forest and if the forest is still >5,000 acres than it can be included in the inventory.
The best example I can use is Holy Cross City and the road leading to it. Holy Cross is surrounded on 3 sides by the Holy Cross Wilderness Area. If you look at the map you will see that the city (ghost town) the trail and the associated buffer is excluded from Wilderness status. (the process going from IRA to Wilderness is not the same as going from forest to IRA. This is the best example I can think of, if you look at the map and see how the boundaries are "rounded")
Got it?
Is inclusion as an IRA the 1st step in the Wilderness process? The short answer is yes. The long answer is a bit more complicated. The Inventory only identifies areas with potential. During FS plan revisions the lands are constantly re-evaluated for suitability as wilderness. Over the years as new leases are granted and development take place within IRA boundaries less land is eligible for Wilderness status. That plus the the ever increasing "Forest/Urban Interface", more land is removed from inventory than is added to Wilderness.
A lot of rumors, mostly inflammatory in nature, were spread by both radical and reactionary forces during our public comment process. I hope I can shed some light on what I found out from the USFS instead of reacting to these rumors.
Inclusion as an IRA IN NO WAY gives the area any "special status" like a Wilderness Area.
When an area is included it is not granted any special protection, so that it will remain in reserve for wilderness status. The 2001 rule did grant a Prohibition from new mining surface leases, commercial timber harvest and new road construction with in these areas. It's the 2001 rule and not inclusion as an IRA that created the Prohibition.
Inclusion as an IRA is not a "stand alone" management plan. IRA's are NOT managed as "de facto wilderness areas". IRA's have been, are and will continue to be managed under the USFS plans and it's revision process. When developing or revising plans the USFS assigns a "category" to all the land under its control. These categories (some times called "Themes" or "Prescription) range from Cat I to Cat VIII. Cat I&II are the most primitive, Cat VIII is the most developed (Think ski area base complex). Cat I&II usually exist together. Cat II is the most "wilderness like" designation and is some times called "flora and fauna" and is used to define areas that are fragile habitat. Cat II usually are small pockets with in Cat I. Cat I is considered "primitive." Cat III is less primitive and can have developed campgrounds, picnic areas and also allows for cattle grazing ect. The reason I mentioned the 1st 3 categories is that almost all of the IRA's fall into these management themes. It is because of their primitive and less developed characteristic that they are assigned these prescriptions and NOT because of their inclusion as an IRA. Its been a chicken and egg debate here, But it's because of their "wilderness like attributes" that they are IRA's and NOT because they are IRA's that they are managed as "de facto wilderness."
Cat I allows for roads and trails for motorized and non motorized recreation (cat II usually does not) Cat III allows for motorized recreation, and as I stated before, development of less primitive facilities.
OK still with me? Lets look at the 2001 rule
The rule DID NOT close even 1 inch of USFS system roads or trails with in IRAs!!!!!!!!!!!!!!!!!!!!!!!(page 3253)
The rule DOSE NOT effect "Trails" for motorized and non motorized use. Trails are defined by the USFS as being less than 50" wide (page 3250). The rule only effects "Roads" (>50" wide)
Trail construction can continue under the 2001 rule.
In the opening pages of the rule, under "Purpose" (page 3245) the rule states "Roadless areas often provide outstanding dispersed recreation opportunities such as hiking, camping, picnicking, wildlife viewing, hunting, fishing, cross-country skiing, and canoeing. While they have many wilderness-like attributes, unlike Wilderness the use of mountain bikes and other mechanized means of travel often allowed". (note the use of capital letters in wilderness)
The USFS interpretation is; since you can't ride your ATV, motorcycle or mt bike or drive your 4x4 in Wilderness areas the rule will preserve primitive areas, for their wilderness like attributes, where you can take a motor vehicle.
There are downsides to the rule and I can address them in another post, but my eyes are going buggy so I'll post up latter. In the mean time I'll be glad to answer any questions.
Happy Trails, Seldom.
P.S. all page # in my posts will refer to The Federal Register page #, its how the rule is numbered. The rule is only 47 pages long.