More like this should be done with those on community service and also those in jail. Get them to do the jobs nobody else wants to do, acts as a visual detterent to others.
I always remember when I was in the US a couple of years ago there was a chain gang of about 6 prisoners all dressed in orange, chained at the ankles escorted by a sheriff with shotgun walking along the side of the freeway litterpicking. Why don't we do this in the UK?