Driving under the influence

A sign about driving under the influence is placed outside of a US naval base.

Driving under the influence (DUI or DWI) is the offence of driving, operating, or being in control of a vehicle while impaired by alcohol or drugs (including recreational drugs and those prescribed by physicians), to a level that renders the driver incapable of operating a motor vehicle safely. Multiple other terms are used for the offence in various jurisdictions.