Pretty much what it says on the tin.
Between Alexis and me sat a center console with a handful of control buttons. The most important of these is the big black "start" button, which I allowed Alexis to press because I am a gracious person. A countdown appeared on the display: 3 … 2 … 1! And then we were off, in the gentlest and least alarming way possible. "Alexis," I said, drawing on all I had learned that day, "this car is fucking driving itself."