Never really known much about US tracks, apart from when you see Laguna Seca on TV, then hear all sorts of negative press about Indianapolis as a motorcycle venue. So, I’ve always wondered what US tracks are really like. I’m guessing there’s good and bad everywhere.
Anyway, here’s two videos of onboard footage from Thunderhill Raceway, California. It looks like a nice track. Loads of safe run off, some decent elevation changes, but sadly too many left turns! 
Some top editing work and cracking soundtrack has obviously made these much more enjoyable too!