Human drivers are imperfect pilots, placed in command of a couple thousand pounds of fast-moving metal. We're just not equipped for the task: The eyes that evolved pointing forward (to better navigate our ancestral home in the trees) mean a smaller field of vision. Even with well-positioned mirrors, a human driving a car in three-dimensional space is bound to have blindspots. But what if the car itself didn't? What if cars could sense where they were, and then communicate that information to other cars? Suddenly, a dense road of imperfectly piloted vehicles would become a smart, safe network, with the cars themselves constantly pinpointing one another in space and time.