Cars have shrunk the world, increased individual freedom, and expanded our horizons in many ways, but there are also their downsides. The smoke from car exhaust helps to damage our environment, poison the air we breathe, and kill us in a more direct way. But all of this will change. This episode enters a world where cars can drive themselves, a world where we are just passengers, transported by healthy, green, and compassionate technology that never goes wrong. It's almost right here. Horizon explores the artificial intelligence needed to replace human drivers in driving cars, envisions the future world of autonomous driving, and finds that despite the glamorous public relations of autonomous driving (assuming they can really work reliably), the reality is that not all of this may be good news. From the ethical issues of autonomous vehicle collisions to the impact on employment, cars may confront us in ways that none of us anticipated.