Autonomous vehicles, also known as self-driving cars, may sound futuristic and like a bit of cheesy ’50s-era science fiction, but the reality is that those cars are on the roads now. Waymo, the self-driving-car unit spun out of Google’s moonshot lab and owned by Alphabet Inc. (NASDAQ: GOOGL) (NASDAQ: GOOG), reported in May that it had completed over 3 million test miles on public roads.