What is the legal limit for BAC (Blood Alcohol Concentration) for drivers in most states?

The legal limit for Blood Alcohol Concentration (BAC) for drivers in most states is 0.08%. This threshold is established to help ensure that drivers are not impaired while operating a vehicle, as higher levels of alcohol in the bloodstream can significantly affect reaction times, coordination, and judgment.

When a driver's BAC is at or above this level, they are considered legally intoxicated and can face severe penalties, including fines, license suspension, and even jail time. The choice of 0.08% reflects extensive research on how alcohol affects driving ability, making it a widely accepted standard across the United States.

The other options represent BAC levels that are either lower than the legal limit or are designed for specific categories of drivers, such as underage or commercial drivers, where lower BAC limits apply. For example, many states impose a zero-tolerance policy for minors, which typically means any detectable alcohol can result in penalties.