To my eternal shame, about 4 years ago, I once woke up at an exes house without remembering how i’d got there, she then informed me I’d driven. Even now i only remember glimpses of the journey, but what i do remember is back roads going about 15-20mph all the way (about 10 miles). I was 18 then and it was definately the kick up the backside I needed.
Now I’ll have no more than 2 and wait for at least an hour or two after the last drink before getting behind the wheel. Even then I definately pay more attention to my driving than I do normally, ie, i don’t let myself go into autopilot.