Define "driving under the influence" (DUI).

Driving under the influence (DUI) specifically refers to the act of operating a motor vehicle while impaired by substances such as drugs or alcohol. This impairment affects a person's ability to drive safely, significantly increasing the risk of accidents. Laws regarding DUI are strict because driving while intoxicated or under the influence of drugs can severely impair judgment, reaction times, coordination, and overall driving ability.

Understanding this definition is vital for anyone undertaking a driving course, as it underscores the importance of responsible behavior on the road, emphasizing that being in control of a vehicle means being free from the effects of intoxicating substances.