Yeah I think this thing is being exaggerated. I mean how does it know the difference between a rock in the road and a paper bag or the difference between leaves in the road and broken glass? Or how about when a cop want you to pull over, does it recognize lights in the rear view mirror? This thing cannot be driving at any reasonable speed.
A cop will never have to pull one over. The Googlemobile will NEVER break any traffic law.
Besides, if the cop wants to stop one, he will just have to activate the remote kill feature that the government will mandate for such cars.