Stanford's Pikes Peak Audi (developed with other industry partners) was not at VAIL, as it had only just made the run up the
Pikes Peak road without a driver and was still cooling down in Colorado before being shipped back.
The Audi is a more photogenic autonomous car than the self-driving VWs from Stanford's previous entries into the DARPA Grand Challenges, and part of the reason is that the Audi has no computer vision technology. While it ran up the Pikes Peak mountain road with a detailed map in its system, and it uses GPS to locate itself, in addition to receiving data from wheel-spin and other sensors so it could drive at the absolute limits of control, it would not, as Beiker told me, be able to steer around a boulder if one was dropped on the road in front of it.