Question "BAC" means: Answers Blood alcohol concentration. Big alcohol content. Blood alcohol conservation. Explanation Blood alcohol concentration (BAC) is a measurement of the amount of alcohol in a person’s blood. Drivers age 21 or older are considered to be driving under the influence of alcohol when their blood alcohol concentration is 0.08 percent or higher. Pass your DMV Written Test with flying colors Take me to the cheat sheet Maryland This questions appears in the following tests: Maryland Practice Test 23 Maryland Practice Test 22