At what blood alcohol concentration (BAC) is it illegal to drive in most states?

In most states, a blood alcohol concentration (BAC) of 0.08% or higher is the legal threshold at which it is considered illegal to operate a motor vehicle. This standard is based on extensive research and data showing that this level of impairment significantly increases the risk of accidents due to compromised motor skills, judgment, and reaction times.

Law enforcement and government agencies have established this limit to promote safer driving conditions and reduce the incidence of alcohol-related accidents. The choice of 0.08% is backed by studies showing that, at this level, an individual's ability to drive safely is notably impaired.

The options representing lower BAC levels do not reflect the standard legal limit, while higher BAC levels exceed the legal threshold and indicate a more severe level of impairment. This regulation serves not only to protect the individual driver but also to ensure the safety of all road users.