This is the test track near Marysville, Ohio which I believe is used by Honda to as a proving ground for their vehicles. The big outer oval is 7.5 miles in length the smaller tracks I don’t know about but I kind of want to drive them. They look like a lot of fun.
The day I was flying over, I saw one car on the big loop. Driving in a single lane at a perfectly steady pace. Worst job in the world.