[Tervuren]

I have seen the direct result of alcohol on different folks with racing sims, or private karting events.

I don't drink, but my take away is that it very much varies from person to person.

Guys that are too tense by nature, will actually improve a little with 3-4 beers.

Guys at the top of the game will fall off a little around 4 beers, but still be better than most.

I think if its seen you aren't in control of your vehicle, that should be the threshold. That includes cell phone, etc.