Our first glimpse of Google’s driverless cars came in 2012. Since then, Google has confined most of its test-drives of these vehicles to the roads outside its headquarters in Mountain View, California, and recently expanded tests to Austin, Texas (reports of other self-driving car tests by traditional automakers have surfaced in a few other spots around the globe). With humans inside, the Google cars’ safety drivers could take control if things went awry. Now the…