Not even progressively larger fines, up to jail time and having your driving licence and car forefeited are proportionate - this still disproportionately affects those less well-off.

Perhaps civil asset and “rights” forefeiture for the rich could be a better solution. With rights I don’t mean human rights, but stuff like being allowed to ride in a car at all (since being rich enough you can hire a chauffeur, even losing your licence isn’t a big deal and you can always rent a car or buy a new one multiplr times over). How this would be implemented (enforced) I don’t know, but it should work. If course it should only be applied to people blatantly disregarding basic civility in traffic and those who don’'t need the car