Sorry, but these types of things are much farther away than you tend to think. Generally speaking the last 5% of a product takes 95% of the overall resources to complete. It might look like we are close to these things, but we are not.
There are other problems with your ideas as well. There would be huge amounts of time where cars sat idle. Usage now isn’t even around the clock. There are periods of the day which are much heavier use than others.
There are many serious concerns regarding us ever truly being able to get there in terms of the automation. How they can react what is going on around them in real time. From unpredictable movements of human drivers to what is going on with a car three cars in front of them causing a possible accident.