Dr. Declan Bedford:

One could say that, and I have no difficulty in understanding that, but the idea of having the big deterrent and having highly visible enforcement is to stop it in the first place. We do not want to see anybody up there. The consequence are not just being put off the road because of the penalty points. It might affect one's job as well, if driving was important to it. Of course, one could still have an accident. The evidence is very clear that for every little bit of extra alcohol one's judgment might just be slowed down enough so that he or she will not react in time if somebody runs out on the road or if a car comes around the corner. As an advocate for safe driving, I would always be going for the lower limit and the high deterrent in the hope that nobody will be caught at all and that everybody will decide not to drink and drive.