Ever since the invention of cars has overlapped with the use of alcohol, the question of how bad drinking and driving really is has loomed over society. The scientific truth is that once your BAC (Blood Alcohol Content) is around .08 it's time to lose the keys and settle in for the night because driving is dangerous.
A startling 80% of car accidents are associated with binge drinking (five or more drinks at a time for males, and four or more for females). High doses of alcohol depress brain centers. This slows thinking and impairs concentration, greatly lowering your ability to react to sudden occurrences on the road such as a yellow light or another car cutting you off. Muscular coordination is also inhibited anywhere from 10-12 hours after drinking, meaning that even if you were conscious of a car suddenly braking, your leg may not necessarily be able to respond in time to hit the brake and avoid a crash. The depression of brain centers as a result of intoxication clearly shows that driving while under the influence is extremely dangerous for you and for everyone else on the road.
The fact is that driving while intoxicated impairs all of the abilities that go into operating a vehicle, so once your BAC nears .08 there is no question as to whether or not you are able to drive. Scientific fact is indisputable, so even if someone "feels fine", their brain is not functioning fully and their driving skills are greatly impaired.