A big change has just happened when it comes to operating your non-plated dirt bike, ATV, or side-by-side on the US forest roads. Those are the roads with the brown 4-digit markers that run both vertical and horizontal.
The changes reference these vehicles as "OHV," which we commonly refer to as "ORV." For all intents and purposes, they are one and the same. OHV is the federal definition and ORV is the state definition.