Not quite sure why you're so smug. You can't give a graduated license to a self driving car so it doesn't even make sense. Plus I know of no self driving care that can even pass a standard driving test yet, like a 16 year old can.
I was being a little smug, but actually what I was going for was withering sarcasm.... missed it by that much...
Seriously though, if the solution for a human is a graduated license, I am not sure why the same wouldn't work for a computer. Nevermind the pedantic "you can't give a license to a computer"... that is obviously not the point. Nor is passing any kind of test.
The point of a graduated license system is to restrict when, where and how a person that is still learning can drive.
Aaaaaaand, I am sure that these principles will be employed during testing of self-driving cars anyway. I really don't think you will see (even in Michigan) self-driving cars all alone on the freeway any time soon.