BAC limits are too high in the US too, in my opinion. 0.08 is buzzed. If you lower that to 0.05 or thereabouts you're pretty much confined to one drink per hour. It takes some of the guesswork / risk flirtation out of it. That, combined with harsher penalties (e.g automatic loss of licence when you exceed the legal limit; Interlock devices etc. when you eventually get your licence back).