To reiterate my original point - the entire ethos of drinking and driving is one of getting as close to the legal limit as possible, without goinv over it - which is the driving equivalent of Russian roulette.
I understand that this culture has grown up because drinking was established for hundreds of years before people had to assimilate driving cars into the process.
Nonetheless, for me, it is a simple mature socially concious decision that if you are going to drink some alcohol, you undertake not to put other people at risk by driving your car.
I know this will never ever happen, because it is socially ingrained, and no government would commit political suicide by even suggesting such a measure.
But I do think that it is a responsible way for society to behave - given its puririent attitudes to drugs other than alcohol.
Yes I am an alcohol-facist.