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

The legal blood alcohol concentration (BAC) limit for drivers over 21 is 0.08%. This standard is established in many jurisdictions to help ensure road safety. At this BAC level, a driver's ability to operate a vehicle is significantly impaired, affecting judgment, coordination, and reaction times. Laws set this limit as a clear guideline, allowing law enforcement to measure and enforce driving under the influence offenses effectively. This threshold helps to prevent accidents and enhances public safety while driving. It's important for drivers to understand that even small amounts of alcohol can begin to impair their ability to drive, making it safer to avoid alcohol altogether when planning to drive.