The Centers for Disease Control and Prevention has published a listing of the effects of different blood alcohol concentration levels on driving skills. Based on information from the National Highway Traffic Safety Administration, the American Medical Association and other organizations focused on curbing drunk driving, the listing shows effects ranging from the level of .02 percent all the way to .15 percent. In Connecticut, as in all 50 states, the legal BAC limit for driving is .08 percent.
The CDC's listing shows that even the relatively low BAC of .02 percent, which is the equivalent of about two beers, involves some impairment in driving skills. There is some loss of judgment and a slight decline in visual tracking ability and in the ability to perform two tasks at once. At .05 percent, which involves drinking one more beer, drivers have reduced coordination, difficulty steering and a lowered response to emergency situations.