That promo is from the Tucson Mountains at gates pass near Old Tucson Studio (where they made hundred's of old western movies) and the Sonoran Desert Museum. Some of these guy's reach speed's of 60mph ( So they said).
It's only a few miles from my house. I ride there all the time, it's a blast!
The Death Race is next Sunday at 3pm. It's getting bigger and bigger every year.