It is closed. Some people have the code to the padlock, it is hit or miss to catch somebody there. The offroad track is in bad shape, almost unusable and the drivers stand is dangerous.
Try:
Turtle Trax in Rome
Atlanta Supercross in Lawrenceville
Loganville
VRP in Brooks
Dalton
Battlefield in Rossville
Hobby Hangout in Douglasville
others...
see List