The 9-Euro Ticket increased public transport use but hardly shifted away from car travel. Train use surged for leisure activities; car use dropped least among commuters. The 9-Euro Ticket led to overcrowding, delaying both regional and non-covered long-distance trains. A rough calculation...

This paper examines the impact of Germany's nationwide 9-Euro-Ticket, a temporary almost fare-free transport ticket, on highway passenger traffic. Using a difference-in-differences approach, we find a significant reduction of approximately 4.5%, primarily driven by decreased weekend traffic....