That may take a while, http://www.slate.com/articles/technology/technology/2014/10/...

"But the maps have problems, starting with the fact that the car can’t travel a single inch without one ... all 4 million miles of U.S. public roads will be need to be mapped, plus driveways, off-road trails, and everywhere else you'd ever want to take the car. So far, only a few thousand miles of road have gotten the treatment .., The company frequently says that its car has driven more than 700,000 miles safely, but those are the same few thousand mapped miles, driven over and over again."