Drunk drivers often say, after the fact, that they did not realize they were too drunk to get behind the wheel. As such, it's important to consider what you'll feel like at different stages, as your blood alcohol concentration (BAC) goes up.
At .02, you'll just feel a bit more relaxed. By the time you get to .04, you may start feeling a little buzzed, but the focus is still on feeling relaxed.
When you reach .06, though, the alcohol begins to impact your cognitive abilities. This is why the BAC limit for truck drivers is just 0.04.
For most people, though, the limit is 0.08. This is the point at which you may begin to feel nauseated. Coordination starts to become impaired, which can make even simple tasks -- like walking -- difficult.
As you pass the legal limit and hit .10, both motor coordination and cognitive judgment continue to get worse. If you make it up into the range between .15 and .25, you could be in danger of blacking out. The same is true as you edge up toward .35, though you could also become entirely unconscious and experts note that there is a risk of death.
Generally speaking, anywhere from .40 to .45 is considered lethal.
Most drunk drivers do not hit these upper levels, which are only an issue after very heavy drinking. However, as you can see, even the lower BAC levels start to impact a person's ability to drive in a hurry. If a drunk driver causes an accident and you're injured, you may want to look into your legal options, as you could be entitled to compensation for your medical bills, lost wages, pain and suffering and more.
Source: MTHETGI, "Blood Alcohol Level," accessed May 05, 2017