Rail is vastly more efficient at transporting people and goods in large volume. This is why automated cars won't turn rail investments irrelevant. The RER B in

Rail is vastly more efficient at transporting people and goods in large volume. This is why automated cars won't turn rail investments irrelevant. The RER B in Paris, a two tracks north-south rail tunnel, is equivalent in capacity to a 40+ lanes highway. Even with automated vehicles, you cannot move the capacity of the Paris, New-York or Tokyo rail network to surface transportation.