What is the legal blood alcohol concentration (BAC) limit for drivers over 21?

The legal blood alcohol concentration (BAC) limit for drivers over the age of 21 is set at 0.08%. This standard is established to promote safe driving and reduce the risks associated with alcohol consumption while operating a vehicle. A BAC of 0.08% indicates that a person has reached a level of impairment that significantly affects their ability to operate a vehicle safely. This limit is consistent across many states in the U.S. As such, drivers at this level or above can be charged with driving under the influence (DUI), which carries serious legal repercussions. Lower BAC levels, as indicated in other options, are typically associated with specific restrictions or penalties rather than the general legal threshold for adult drivers.