one thing: I do NOT like the idea of riding in a self-driven car when the majority of other cars are driven by humans. That doesn't seem ideal to me. I worry about a self-driving car driving exactly the speed limit and not being able to speed up whenever you need to, to either keep up with the traffic, or when someone is tailgating you. Especially at night, when you are driving and tired people drive straight up to you and don't slow down until the last second. I want to speed up in those instances.