Freakonomics reports that walking a mile drunk turns out to be eight times more dangerous than driving one mile drunk:
In 2009, the most recent year for which we have data, about 34,000 people died in traffic accidents. Roughly half of them were drivers — 41 percent of whom were drunk. There were more than 4,000 pedestrians killed — and 35 percent of them were drunk. Of course, a drunk walker can’t hurt or kill someone else the way a drunk driver can, and people drive drunk much farther distances than they’d walk drunk. But the danger is hardly insignificant, says trauma surgeon Thomas Esposito.