Hi
I live in France, where the drink/drive limits are lower than in the UK, but they seem to have the same problems with drunk drivers. As part of a 'safe drinking and driving campaign' last summer, we were given a little cardboard wheel thingy with 2 sets of data on it for men and women, depending on your weight - one set of data is your safe limit to drink wine if you're eating, the second set of data is for drinking wine without eating. Unfortunately, I can't lay my hands on it right now so I'm not able to be more specific - soz! If I come across it, I'll come back with any more info I can.
Sharon