It makes more sense to view such statistics on a 'per trip' basis (i.e. x% of drunk walking trips end in death and y% of drunk driving trips end in death).
You'd really need to take the level of drunkenness into account, too. If you give me three beers I'll be too drunk to drive, but not "drunk" in the usual sense of the word. You'd have to give me another ten before I start being dangerous at a walking pace.
The biggest problem, though, is the random assumption that the same proportion of miles are walked drunk as are driven drunk. I personally have walked quite a few miles while drunk, but have driven no miles while drunk, and I hope I'm not the only one.
You'd really need to take the level of drunkenness into account, too. If you give me three beers I'll be too drunk to drive, but not "drunk" in the usual sense of the word. You'd have to give me another ten before I start being dangerous at a walking pace.
The biggest problem, though, is the random assumption that the same proportion of miles are walked drunk as are driven drunk. I personally have walked quite a few miles while drunk, but have driven no miles while drunk, and I hope I'm not the only one.