What is the legal BAC limit for drivers over 21 in most states?

The legal Blood Alcohol Concentration (BAC) limit for drivers over 21 in most states is 0.08%. This standard is widely recognized across the United States and represents a threshold at which an individual's ability to operate a vehicle is considered impaired. The rationale behind this limit is based on studies indicating that at this level, many individuals experience reduced coordination, slower reaction times, and impaired judgment, increasing the risk of accidents. Consequently, driving with a BAC at or above this level poses significant dangers not only to the driver but also to other road users.

States have implemented this uniform limit to promote road safety and reduce alcohol-related incidents on the highways. While some states may have stricter laws or additional regulations for specific groups, such as commercial drivers or underage drinking, the 0.08% limit is the baseline for adult drivers in most jurisdictions.