Uber CEO, Dara Khosrowshahi, predicts that robot drivers will replace human drivers in 15 to 20 years.The main reason for the transition is that robot drivers are expected to be safer than human drivers.However, for autonomous vehicles to become ubiquitous, a consistent regulatory environment, ground operations, and lower costs are necessary.Khosrowshahi believes that ridesharing will eventually beat personal car ownership in a world with autonomous vehicles.