The weakest part about the conclusions in this study is the assumption that regulation does not change. If the limitation of driving disappears and the roads be

The weakest part about the conclusions in this study is the assumption that regulation does not change. If the limitation of driving disappears and the roads become a tragedy of the commons, then regulation will have to step in to limit how much people drive. We already do this with tolls, car pool lanes, taxes, etc. You can't take it as a given that our society will not seek to reorganize itself around the new paradigm. It's like someone in 1990 saying "once content is on the internet piracy will be out control and nobody will make money with content ever again, check out this experiment we did."