Those second million might have happened in my neighborhood in Chandler, AZ. for the past year at least, we've had swarms of them driving around our neighborhood streets at all times of the day and night, thought not late night that I'm aware of (ie mid-5 am, as a linux lead for several large international companies, I get more done at night so I'm up working those hours when no one annoys me with chats etc). At times we've seen 6 driving through our streets all in a line. Driving from pickup up dinner and gas yesterday, about 2 miles, I saw 3 of them including one at the pump next to us at the gas station (we drive a Volt, $13 fill up! W00t!). At first it was interesting, now it's just another car on the road. Haven't heard of any accidents, nor seen any. Though I haven't looked, you might be able to catch some in Google Maps sat images, I see our cars every refresh.
It's very comforting to see them being used so successfully locally, and really gives you some confidence in the product.