In the 1970's, Car and Driver Magazine borrowed an autocross track for an informal study of drinking and driving. They found that even with one drink, impairment begins. By the time you reach the legal limit, no matter how much you normally 'temper' yourself and believe in your ability to handle alcohol, your judgement can be so impaired that the miracle is getting home in one piece. Every one of the testees said he was fine, even when his Blood alcohol content was above the limit.

If, in your opinion, a potential driver is drunk, especially if a friend, don't hesitate to ask for their keys, to be returned the following day. It's better to have a long fight than a funeral.