If you have more than a couple of pints after your tea during a 9hr break then there’s a good chance you could be over the limit the next morning, but does that mean you’re unsafe to drive? I’m not so sure. Obviously if you have a massive hangover then you’re not going to be as responsive as you would be without one, but you could say the same about driving with man flu, or even if you have a lot of worries that are troubling your mind and hurting concentration.
Personally I’ve driven many times after a proper skin full the night before and back in the old continental days, many of us had a glass or five of vino callapso with our tea and carried on for a few hours down the road after, I don’t think my driving skills suffered at all, if anything the fear of getting pulled over and the consequences of that made me drive a lot safer.
We’re talking about people that drive extensively and as such a lot of the things you have to do in order to drive safely are instinctive actions, so in theory that should mean that our driving is not as affected by alcohol as somebody that doesn’t do a lot of driving and has to think before they take any actions that come naturally to us.
However, the law is the law, so it is what it is, unfortunately the only way to judge impairment is by the cold hard facts of alcohol levels and that means that you can get a DD even if you’re not impaired at all, such as the following morning breath test failure and you will be judged in the same way as somebody driving down the road swigging a bottle of scotch. I think there’s a big difference between the two myself, the law doesn’t though, so now I don’t get bladdered on a night before I’m driving, I’ll have a few, as long as I’m having a good 8yrs before the last one goes down and the key goes in the ignition.