> As far as I know(I don't drive) there is no need to ever re-take the theory test which has been revised a number of times since many people took their license

> As far as I know(I don't drive) there is no need to ever re-take the theory test which has been revised a number of times since many people took their license in the first place or pass any kind of medical to have it renewed. That is correct. However, this is also true in the US. So since neither requires retaking any tests upon renewal, Swedish drivers (assuming initial premise to be correct) will always be better than their US counterparts, on a proportional decline over time on a graph. I agree that there might be something to do there, but it is again not invalidating the initial statement.