It looks like
Wired obtained an explanation from each of the teams involved the darpa grand challenge. As one can see in a previous of my post, it looks like they did not really got the good explanation. Oh well, you cannot blame the teams from divulging their weaknesses. On a related note, NASA is coming up with grand challenges on their
own. I hope they are not asking people to do a Mars mission with only 250 K$ of prize money....