Driving Under the Influence (DUI)
Commonly called "drunk driving," it refers to operating a motor vehicle while one's blood alcohol content is above the legal limit set by statute, which supposedly is the level at which a person cannot drive safely.

Driving While Ability Impaired (DWAI)
You drove a vehicle after consuming alcohol and or drugs such that you were less able than you ordinarily would be, even to the slightest degree, to drive the vehicle with safety to yourself and to the public