1(800) 615-1067Drunk driving, also known as driving under the influence (DUI) or driving while intoxicated (DWI), refers to operating a motor vehicle while impaired by alcohol or drugs to the extent that it affects the driver’s ability to safely operate the vehicle. The legal limit for blood alcohol concentration (BAC) varies by country, but in the United States, a BAC of 0.08% or higher is considered illegal.