Thanks, like I mentioned before, the image is from Google Maps. I edited it in Paint Shop Pro to make it look more like an illustration than a photo. The rest was all done from scratch in Adobe Illustrator. I've got a set of brushes that are modeled after the track pattern, so making the basic track shape isn't that much work. Hopefully, I'll get more up, but I've got other projects I'm working on right now.
Thanks for all the positive comments! I think this is the most feedback I've ever gotten. I hope people try it out and let me know what they think.
Just a quick note to let people know that I've updated the track to make the corkscrew a three stop turn. Please let me know what you think of the change.