I agree, and if we had decided to create an autonomous car only line where the speed gets controlled by a central computer, this would apply. You still shouldn'

I agree, and if we had decided to create an autonomous car only line where the speed gets controlled by a central computer, this would apply. You still shouldn't ignore that the higher the speed, the more likely larger speed differences can appear. At some point external force will slow down cars significantly faster than the brake of the vehicle behind.