I used to rent a room to a guy that had THREE drink driving convictions, after I booted hi out for being an alcoholic, he got a FOURTH.
These people do not learn.
I say 1st, 3 months prison, 2nd 6 months, 3rd a year, 4th 2 years, 5th 4 years etc.
I'd also like Judges to ban people for life after 3 convictions, but never happen