its a huge problem in n ireland or at least it was as the cops during the troubles had other priorities.
when ever we ran road blocks the number of problems we had with drunk drivers was rediculous, the odd one even decided to try and drive through and got fired upon.
also saw several road traffic accidents involving fatalities and it was never the drunk driver that died.
ever since then i have stuck to ginger ale when driving, although now i rarely drink anyway due to amount of drugs i take. i have to keep a prescription in the car as the codeine would fail the roadside test kit.