Google recently reached a huge milestone by logging its two millionth autonomous mile. For context, two million miles is the equivalent of 300 years of human driving, not exactly insignificant. Driving the first million miles took Google six years. The next million, just 16 months. As the regulatory environment continues to warm to the idea of putting driverless cars on city streets and highways, the miles are going to accumulate even faster. That’s a good thing for autonomous car-watchers everywhere. The first 90 percent of driving, according to self-driving software lead Dmitri Dolgov, is easy to master. It’s the next 10…

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