What does BAC stand for in the context of driving?

BAC stands for Blood Alcohol Content, which is a measurement of the amount of alcohol present in a person's bloodstream. It is expressed as a percentage, indicating the mass of alcohol per deciliter of blood. Understanding BAC is crucial for driving under the influence, as it directly correlates with impairment levels, which can affect judgment, coordination, and reaction times. Legal driving limits for BAC are established to help ensure roadway safety, with most states in the U.S. setting the limit at 0.08% for drivers over the age of 21. Proper knowledge of BAC helps drivers make informed decisions about consumption and driving, contributing to safer driving practices overall.