I already stated why humans and autonomous vehicles can't occupy the same roadways.

A computer is limited to its programming, a human has no such limits. Even if we wanted to we couldn't program enough information into a computer to match the complexity of the human brain. On a complexity scale computers are just a notch above the calculator.

The autonomous vehicle of the future will need to communicate with other autonomous vehicles on a continuous basis. However no such communication will exist between human and autonomous driven vehicles, end result carnage on the roads.

Next is the roadways themselves, autonomous vehicles will require roads with sensors built in, none exist to date. We will also need dozens of satellites dedicated to providing GPS to autonomous vehicles. Current GPS used on vehicles is completely unreliable.

Tesla has already had 2 fatalities and their vehicles are only level 2 autonomous, fully autonomous would be level 5.