It's not viable in cities, but large parts of commutes and congestion are on freeways where they are banned anyway. We don't even want cars driving 100 mph in c

It's not viable in cities, but large parts of commutes and congestion are on freeways where they are banned anyway. We don't even want cars driving 100 mph in cities because of noise and pollution (for gasoline cars). And if we went fully AV, we could still do away with traffic lights for cars in cities, as long as pedestrians and cyclists have their own safe passages and/or AVs are smart enough to deal with them just crossing at will.