In spring 2022, the German federal government agreed on a set of measures that aimed at reducing households' financial burden resulting from a recent price increase, especially in energy and mobility. These measures included among others, a nation-wide public transport ticket for 9EUR per month and a fuel tax cut that reduced fuel prices by more than 15%. In transportation policy and travel behavior research this is an almost unprecedented behavioral experiment. It allows to study not only behavioral responses in mode choice and induced demand but also to assess the effectiveness of transport policy instruments. We observe this natural experiment with a three-wave survey and an app-based travel diary on a sample 2'263 individuals.
Reference: Loder, Allister/Cantner, Fabienne/Cadavid, Andrea/Siewert, Markus B./Wurster, Stefan/Goerg, Sebastian/Bogenberger, Klaus 2022: A nation-wide experiment: fuel tax cuts and almost free public transport for three months in Germany -- Report 4 Third wave results, arXiv (https://arxiv.org/abs/2210.10538)