I expect when self driving cars are introduced congestion will be more or less unchanged. It will take 20 years or so for people to switch over, and during tha

I expect when self driving cars are introduced congestion will be more or less unchanged. It will take 20 years or so for people to switch over, and during that time roads won't be expanded. The net benefit will be we won't spend much money on new roads for for a few decades.