DARPA held their 2007 Grand Challenge over the weekend. The goal was to have completely autonomous vehicles interact with a road course that contains other cars, street signs and regular urban obstacles. These completely unmanned vehicles were given a mission file before each challenge that was uploaded into the vehicle and a time limit to complete the course. Other than that, they were not human controlled in any way.
Here is a video of the MIT car getting impatient at a stop sign and trying to go around Cornell. I think this is awesome. An unmanned vehicle getting antsy over a car taking too long at a stop sign.