There are lots of subtleties in in-town driving. For example, the Google car will crawl its nose forward just a bit to indicate when it thinks its turn has come

There are lots of subtleties in in-town driving. For example, the Google car will crawl its nose forward just a bit to indicate when it thinks its turn has come at 3 and 4-way stops. This is a strong signal to the other drivers that the car is about to make the turn, and reduces the frequency of contentions inside the intersection. It's a nice touch to have the robot replicate behaviour that most people are not even aware they are using.