The reason offered by the study was that since unvaccinated people refused to bow to official pressure to get the jab, it follows that they must also be less likely to adhere to the rules of the road and pay attention to traffic lights and road-signs, which would presumably make them more likely to crash. That's it! No empirical data, no other reason. Just garbage made to look scientific by being wrapped up in peer review and published in a journal so it can be cited as if it were unassailable truth.