What is a primary cause of driver fatigue?

Being tired or exhausted is a primary cause of driver fatigue because it directly affects a person's physical and mental alertness, making it difficult to react to sudden changes in driving conditions. Fatigue can impair a driver's ability to focus, process information, and make decisions effectively, increasing the risk of accidents. When a driver is not well-rested, they may also experience a drop in attention span and slower reaction times, which can lead to dangerous situations on the road. Proper rest is essential for maintaining the concentration and alertness required for safe driving.

While lack of physical fitness, emotional stress, and high-speed driving can contribute to overall driving challenges, they do not specifically lead to the state of fatigue in the same direct way that being tired or exhausted does.