It is open to the public when the gate is unlocked. There is an onroad series being run every other weekend, please be careful going on these days they do not want any radio frequency interference.
There is an on-road track, a concrete oval and an off road track. There is no power or water, only a singe porta-potty. Since the off-road track is not regularly maintained, it is somewhat rutted and may hold water in places.
Basically, if the gate is open, it is open.