For years, the car of the future has been stuck going in circles. Although Google's converted self-driving Lexuses have hit the road in a few select areas, the company's custom-designed fully robotic self-driving car has been confined to the test track. But there's only so much that can be learned in a testing zone, even for an autonomous car. Announced today, Google's cars will like fledgling birds leave their nest, and travel forth onto the streets of Mountain View, California. And they'll do so very, very slowly. For their city driving, Google is capping the cars' speed at a neighborhood-friendly 25 mph.