The exact number of drunk drivers that can be classified as alcoholics is not known.
One study indicates that a little over one half of drunk drivers can be classified as "binge / heavy drinkers".
Let's examine some simple logic in regards to alcoholics and drunk driving.
To drive drunk you must do two things (1) drink and (2) drive.
Thus, to prevent alcoholics from driving drunk, we have two primary options...
Option 1: Drink but don't drive
Option 2: Drive but don't drink
Why option #1 fails for many alcoholics...
The problem with alcoholics is that, by definition, we drink and get drunk.
Because alcohol affects reasoning ability, alcoholics all too often engage in risky and illegal behavior including driving while drunk.
An alcoholic may have good intentions before drinking. However, when drunk, good intentions usually fly out the window.
The high rate of repeat drunk driving offenders supports this fact.
Thus, for most alcoholics, the only sure way to avoid drunk driving is to abstain from alcohol completely.