Over the course of my lifetime societal attitudes to drink driving have completely changed.
While 40 years ago having a few drinks at the pub then driving home may have been the norm, today it's frowned upon, to say the least. In extreme cases we hear of people wrestling keys away from drunks, such is the awareness of the carnage a drunk can cause on the roads.
A large part of this has been the TV advertising - "If you drink and drive you're a bloody idiot" - along with police blitzes and stern sentences.
More recently we have seen the ads with a milkshake-drinking stoned man as well as three young kids imitating how their dad drives while stoned. Efforts are being made to educate the coming generations that not just drink driving, but drug driving too, is a problem.
Yet many people still think drug driving is not an issue. New Zealand research conducted in 2009 found that people who drive under the influence of drugs think it's a relatively safe thing to do.