If he's a high-functioning alcoholic that can come with complete denial of a problem to begin with, so the sensible option of having someone else do the driving often isn't even a consideration. Horrible to think it could be absolutely anyone on the road at any time, like happened with those kids not too long back here.
It is an unlimited fine these days. They look at the seriousness of the event and work on a percentage of the weekly wage. Think his will have been about 150% of weekly wage. Drop in the ocean to him.