They did a study for a small- to medium-size town in Germany – based on traffic modelling, it was estimated that an extensive on-demand system with almost 500 on-demand vehicles would only have about the same effect on passenger numbers as simply extending all existing fixed-routes bus routes to run every ten minutes all day (which for a town of that size is a rather good service), but operating the fleet of on-demand vehicles was so expensive that even fully automated on-demand vehicles were significantly more expensive than driver-operated conventional buses (never mind automated conventional buses).