I'd like to give an example too. In the case of this mix of human and self-driving cars, you can imagine that the way a traffic jam can form is just through, let's say, rubbernecking. Someone will be driving by. You'll look, and you'll slow down. That will cause the car behind you to slow down, and then the car behind, and suddenly there is a big traffic jam. It just snakes its way back.
One possibility is that this will cause all the automated cars to get into that jam as well. If you have some kind of a hybrid system, however, and you still have a human driver, but it detects that the car in front of you has started to slow down, it wouldn't slow down as much as a human would, and the car behind it would be affected differently. Then you would avoid that traffic jam that would otherwise have been caused by a human driver without any kind of assistance.
There is a kind of hybrid system there that could be implemented.