[joeysteele]

Perhaps the answer is to make it an offence to drive at all if you have been drinking. Some people are affected by low amounts of alcohol,others after a lot.
Clearly there can be scales for penalties for driving after drinking, but it may just help to, if not stop people drinking and driving at least make sure they drink very little before driving if they know the law is not to drive after drinking alcohol at all.
One fool, driving with drink she/he thinks doesn't affect them much who then hits someone and kills or seriously injures them,doesn't just harm that person, they cause trauma and pain for Parents, Granparents, Brothers Sisters, a whole knock on effect to Families and Friends.
The other side of the coin is,there are amny fools on the road anyway, once they come across who they think is a drunk driver then they will goad them.
Driving a car,you need to be in the right and under no influence of any substance,you at least then have a chance to enjoy safer,worry free journeys.