Rally cross ... and private property . I'm super lucky in that my crew cheif owns 600 acres. also BLM land, FS roads , OHV Parks , etc.
Excluding rally cross and private property with owners permission , You can't go driving on public lands at full on rally speed , nothing even close .
Also this has been a big part of my success and good finishing rate (I'd tell you what it is, but I don't want to jinx myself) Driving your rally car to work at least once , hopefully 2-3 weeks before a rally.
I've found issues a few times doing that .. lost 2nd gear a week before Idaho in 2009 or on my way to work. dropped the car off to be fixed @ lunch and picked it up after work, and drove straight to the rally (this was back when i was Cool (low budget) and drove to events)