Which of the following can impair your driving?

Lack of sleep can significantly impair your driving abilities. When a person does not get enough rest, their cognitive functions, reaction times, and overall alertness are all detrimentally affected. This means they are less able to process information quickly or make sound decisions while driving. Fatigue can lead to slower reflexes, difficulty focusing, and increased likelihood of falling asleep at the wheel, which severely compromises road safety.

In contrast, bright weather typically enhances visibility rather than impairing driving. Being overly confident might lead to riskier decisions, but it doesn’t directly impair driving in the same way as lack of sleep does. Finally, familiar roads can actually improve confidence and situational awareness, making it easier to navigate without the additional stress of unknown environments. Therefore, among the choices, lack of sleep stands out as the most direct and impactful factor that can impair driving performance.