This might defeat the purpose, but why not have remote controlled cars. A digital taxi driver could alleviate a lot of the problems that we currently have with

This might defeat the purpose, but why not have remote controlled cars. A digital taxi driver could alleviate a lot of the problems that we currently have with non-autonomous cars, except bypasses the whole open-research problem of having roads full with autonomous vehicles. What's being done right now with digital assistants is a similar strategy.