Result:

The KS test informs us that there is a significance between the distribution of the data (number of daily accidents) before and after Vision Zero is applied, i.e., we reject the Null Hypothesis. This is based on the resulting p-value of the test which is orders of magnitude less than the chosen significance level (p = 0.01). To confirm that this is indeed the case, an Empirical Cumulative Distribution Function (ECDF) is plotted.