What effect does lack of sleep have on a driver, based on Officer Cox's experience?

Lack of sleep significantly impairs a driver’s reaction time, which is critical for safe vehicle operation. When a driver is sleep-deprived, cognitive functions, including alertness, decision-making, and motor skills, diminish. This can lead to slower responses to unexpected events on the road, such as sudden obstacles, changes in traffic, or the actions of other drivers. Officer Cox's observations likely highlight that fatigue can make it difficult for drivers to react promptly, thereby increasing the risk of accidents. Maintaining adequate sleep is essential to ensuring that drivers remain attentive and can respond swiftly to challenges encountered while driving.