What is one of the first effects of alcohol on a driver?

One of the first effects of alcohol on a driver is that it affects judgment and self-control. Alcohol impairs cognitive functions, which can lead to a reduced ability to make sound decisions and evaluate situations accurately. This impairment can result in overconfidence, leading a driver to underestimate risks, make poor choices regarding speed, or engage in risky driving behaviors. The diminished judgment caused by alcohol can compromise a driver’s ability to react appropriately to road conditions, traffic signals, and the behavior of other drivers, significantly increasing the chance of an accident.

The other options, such as improved reflexes, enhanced concentration, and increased alertness, are not typical effects of alcohol. In fact, alcohol tends to slow down reflexes and distract from effective concentration, further underscoring why the correct answer highlights the crucial issue of judgment and self-control when driving under the influence.