The last time Google’s self-driving car team checked in with us over a year ago, when it announced Google’s cars had driven more 300,000 accident-free miles. Today, the team announced in a blog post that the cars have now driven over 700,000 miles. The team has been focused on improving the self-driving cars in cities rather than on freeways, mostly testing this in Google’s hometown of Mountain View, California, and this focus on city driving has produced some impressive results. The sensors on the self-driving cars can now detect with impressive detail everything from pedestrians and buses to “a stop sign held up by a crossing guard, or a cyclist making gestures that indicate a possible turn.” It can do this all, of course, without getting distracted or