What term describes driving a vehicle while impaired by substances?

The term that accurately describes driving a vehicle while impaired by substances is Driving Under the Influence (DUI). This terminology specifically indicates that a driver operates a vehicle while their faculties are compromised due to alcohol, drugs, or other substances that affect their ability to drive safely. DUI is a critical legal distinction in traffic law and carries substantial penalties because it directly relates to impaired judgment, coordination, and reaction times, which can lead to dangerous situations on the road.

The other options represent different legal concepts in traffic violations. Reckless driving involves operating a vehicle in a way that shows a willful disregard for the safety of persons or property. Negligent driving describes conduct that falls below the standard of care that a reasonable person would exercise, leading to unsafe situations, but does not necessarily involve substance impairment. Excessive speeding, while dangerous, pertains to driving significantly over the speed limit without implying impairment due to substances. Each of these terms captures distinct behaviors that can lead to traffic citations, but they do not relate to substance impairment like DUI does.