Driverless cars are real and getting better by the day. Tesla owners have already driven over 75 million km on Autopilot since October 2015. Over the coming years, not decades, machines will increasingly replace humans at the ‘steering wheel’. Autonomous vehicles drive more predictably and can follow each other closer than humans in cars ever could. This means that once enough of them are on the road, a given stretch of road can carry more vehicles, in narrower lanes, than human drivers who need space to drive poorly.