The more I think about it, the more the track choice baffles me.
With the money being thrown at this, you'd have thought they'd be able to use either a real track, or at the very least a well-known and well-used airfield. Sure, that might have put paid to any secrecy, but it would've given them serious credibility.
To run cars on a 'track' that requires you to turn around and run it backwards is utterly bizarre.