There is a discussion going on about whether or not the limit for blood alcohol should be reduced from 80mg/dl to 50mg/dl. It is argued by some that this would reduce substantially the number of people who die in road accidents. The problem is, however, that this is not generally accepted to be true. There are two aspects to such a change. The first is whether there is a problem with people whose blood alcohol is between 50mg and 80mg causing large numbers of fatalities. The second aspect is whether making such a change would have the effect of reducing drink driving overall - a laudable objective. The other question is whether it is worth introducing a particularly low limit for novice drivers of say 20mg/dl which says basically don't drink at all if you are not an experienced driver. I think there is a good argument for this as it would get new drivers into the habit of not drinking and driving. To me, therefore, the key question for the 50mg/dl change is whether that would sa...