While I do think the UK PSAs are probably very effective, I don't think it necessarily holds that the countries with the most shocking PSAs are the ones with the smallest drink-driving problems.
I don't have any data to back it up, but I do remember seeing statistics which showed that, after the successful PSA campaigns in the 90s, the UK had to start seriously considering the effect of the road quality as contributory to accidents.
Reading between the lines:
a: car manufacturers make safer cars
b: driving education is both better than it ever has been, and one of the best in the world (but there's still some to go! see scandinavia's skid pan training and such for ALL drivers!)
c: driver error is a lot smaller than it used to be.
Yes, there are still those who will drink and drive. I think we need to go thru one or two more generations before this is essentially eradicated. But the gulf of difference between the UK and US attitude to this is astounding.
