Traxler, Christian Max Planck Institute for Research on Collective Goods, Max Planck Society;
https://doi.org/10.1016/j.jpubeco.2017.11.006 (Any fulltext)
Traxler, C., Westermeier, F. G., & Wohlschlegel, A. (2018). Bunching on the Autobahn? Speeding responses to a 'notched' penalty scheme. Journal of Public Economics, 157, 78-94.