Define 'impaired driving'.

Impaired driving refers specifically to the operation of a vehicle while under the influence of substances that can negatively affect a person's ability to drive safely, such as alcohol or drugs. This definition encompasses not only alcohol but also illicit drugs, prescription medications, or any substance that alters a person's cognitive functions and motor skills, making it dangerous to operate a vehicle.

The focus on substance influence is critical because it directly impacts reaction time, decision-making abilities, and overall driving capabilities. Understanding this definition helps emphasize the importance of safe driving practices and the legal ramifications associated with impaired driving, which is a significant public safety concern. Other options, while relating to driving safety, do not align with the specific definition of impaired driving as they pertain to different aspects of driving behavior or legal compliance rather than the influence of substances.