I've only been 'drunk' twice in my life, and both times I was on foot, or in my room.
However back in the day, we used to always have a beer in the car and I remember getting special holders to put the Miller GD bottles in. When we'd
go camping, part of the packing ritual was to put a case in the car and carry enough ice to last the two day trip. We didn't drink but one or two
beers on the way, and I never had any 'high' - it was a thirst quencher.
I never drank liquor, and three beers was my limit.
Now I don't drink at all. If I have half a bottle of beer I can feel it. I've probably had less than three beers total in about 20 years, though
I'll sit at home and have one glass of champagne for NewYears some years and not finish it.
Not saying I'm holier than thou...but seems there's more traffic and people are more distracted than ever (cell phones, eating stuff, putting on
makeup, shaving). It's all bad, imo.
As you say, if he penalties are sufficently high - zero tolerance, then people won't do it. It's too much of a risk to even be caught once...
But again, I don't like the personal searching and bio-intrusiveness.
It would be nice if there was some way to detect impairment of all kinds (age, sleepiness, stupidity, inattentiveness, lack of mechanical aptitude,
substances, booze, you name it) If you are impaired then you can't get the car started or something.
The solution is probably to have all automated cars where we're just passengers.
In some ways I'm more afraid of 18-wheelers on meth who haven't slept in 4 days than I am of a casual drinker with a BAC of 0.08.