The typical car is on the road 1% of the time. The typical driver-less car will be on the road whenever possible, so will see 100x usage. Just 1% of cars being driver-less will therefore double cars on the road. That will go to things that are good - taking the kids to soccer practice, go to things that are neutral - sleeping in the car as it drives to the beach, and it will go to things that are wasteful, like shipping a single package to a single customer and then going back to the store. But traffic congestion scales exponentially, and cars don't scale at all. So in reality, the entirety of the city will be a traffic jam and you won't be able to get anywhere. Just as we've seen buying GPU's during the crypto shortage, the bots will win, your time can't compete with automation.

So in reality in a world that has driver-less cars, the first thing we will see is a congestion tax. And the first thing we would like to see as a result of that congestion tax is better public transportation. Driver-less buses will do well, especially if they have dedicated lanes. Trains will do better. If you think that you can avoid public spending on public transportation because driver-less cars will save you, you are mistaken. You should be funding that such that if driver-less cars become a reality, but even if they don't, you will be ready.