Malumbo, I think the "don't drink and drive" rules were effective because they were so inflexible. I was a junior reporter (in a magistrates court) in about 1976 when this guy was in court, charged with being drunk in charge of a car. He had come out of the pub, opened the car door, and passed out in the front seat with his keys in his hand. He was a travelling salesman and his defence lawyer pleaded that he would lose his job if he was banned from driving. The magistrates actually apologised to him but said that they had no choice but to ban him for a year. Self-evidently they would have let him carry on driving if they had been able to. But they weren't. It's this absence of wriggle-room to which I attribute the law-change's rapid success -- supported by peer pressure I agree -- plus police enforcement. All those Christmas campaigns