This is fascinating, and quite surprising for me (perhaps that just says more about my biases). Does anybody know if the results in the paper are partially explained by less corrupt countries having people that prefer to drive less? I.e., perhaps the Japanese diplomats rack up less parking tickets in NYC simply because they drive less and don't necessarily rack up less parking tickets per unit of time driving. You can make a reasonable link between wealthier countries being less corrupt and also wealthier countries having better public transportation systems, making their citizens more likely to use these systems anywhere