What blood alcohol concentration (BAC) level is considered impaired for drivers?

The blood alcohol concentration (BAC) level that is considered impaired for drivers is .08 or more. This threshold is significant as it is the legal limit for driving under the influence in most states across the United States. At this level, a driver’s ability to operate a vehicle safely is adversely affected, leading to decreased coordination, slower reaction times, and impaired judgment.

Authorities have established .08 as the standard after extensive research demonstrated that driving performance deteriorates at this level. It is important for drivers to be aware that even lower BAC levels can still impair their driving ability and contribute to accidents. However, .08 has been widely accepted as the threshold for legal impairment, making it a crucial point of reference for understanding the risks associated with drinking and driving.