There is this kind of oval track and some others, but you would like to have even bigger? https://www.beamng.com/resources/thunder-valley.2522/ There is Indianapolis: https://www.beamng.com/threads/indianapolis-motor-raceway.20501/ There was also some other ovals, but not really something like superspeedway. There is Daytona, however it is not the best of quality, size is wrong etc.
