Which of the following factors does NOT contribute to driving impairment?

Familiarity with the road typically helps drivers navigate more safely and confidently, as they are likely to be more aware of road conditions, traffic patterns, and potential hazards they might encounter. This familiarity can contribute to a driver's ability to react appropriately to changes in the driving environment.

In contrast, fatigue, distraction, and emotions can significantly impair a driver's ability to focus and make sound decisions on the road. Fatigue can slow reaction times and decrease alertness, distractions can divert attention away from driving tasks, and strong emotions can lead to impulsive or irrational driving behavior. Thus, familiarity with the road does not contribute to impairment but generally aids in safe driving practices.