What is the effect of fatigue on driving ability?

Fatigue significantly impacts driving ability and can lead to impairment similar to that caused by alcohol consumption. When a driver is fatigued, their reaction times, decision-making skills, and overall cognitive functions are decreased. This impairment can manifest as difficulty focusing, slower reflexes, and a reduced ability to process information and respond to sudden changes in the driving environment. Such effects can be as severe as being under the influence of alcohol, which is why it's crucial for drivers to be aware of their alertness levels before getting behind the wheel.

The other options do not accurately reflect the impairing effects of fatigue on driving. Fatigue does not improve concentration or increase alertness, and it certainly has a detrimental effect rather than having no effect at all. Thus, recognizing fatigue as a significant risk factor is essential for safe driving practices.