What is a common cause of driver fatigue?

Long driving hours, lack of sleep, or medications are recognized as common causes of driver fatigue. When drivers operate a vehicle for extended periods without taking necessary breaks or rest, fatigue can set in, significantly impairing their ability to maintain focus and react promptly. Additionally, inadequate sleep reduces alertness and increases the risk of drowsy driving. Certain medications can also contribute to fatigue, as some may induce drowsiness or have side effects that impair concentration and alertness.

The other choices do not effectively capture the primary factors that lead to driver fatigue. Passenger distractions might be an issue in terms of attention but do not inherently lead to fatigue. Although excessive use of air conditioning can cause discomfort, it does not fundamentally contribute to fatigue like the factors mentioned in the correct choice. Similarly, driving without music may affect the driving experience but is not a direct cause of fatigue in the same way that long hours, insufficient sleep, or sedating medications are. Thus, understanding the significant impact of rest and alertness on driving is crucial for safe driving practices.