What is the legal blood alcohol concentration (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 level was established to promote safe driving and reduce the number of alcohol-related accidents, as studies show that impairment begins to significantly affect driving ability at this threshold.

A BAC of 0.08% means that there are 0.08 grams of alcohol per deciliter of blood, which can lead to decreased coordination, slowed response times, and impaired judgment, all of which compromise driving safety. Consequently, law enforcement agencies and traffic safety organizations enforce this limit strictly to deter impaired driving and enhance public safety on the roads.

The other choices represent lower or higher BAC limits, but they do not reflect the standard legal BAC limit set in the majority of jurisdictions for non-commercial drivers aged 21 and older. While some states have lower limits for specific categories of drivers, including those under 21 or commercial drivers, the universal limit for adult drivers is indeed 0.08%.