I'm not anti self-driving cars in general, but I do think as they get more popular they should be taxed extra for every mile they drive without a person (or at

I'm not anti self-driving cars in general, but I do think as they get more popular they should be taxed extra for every mile they drive without a person (or at least without cargo). A self-driving car may decide to drive around an empty street in a city instead of find parking, because it's cheaper, but its a negative externality.