**Alcohol** significantly affects a driver's behavior. One of the most notable effects is that it generates a **false sense of self-confidence**. This means that the driver may feel more confident than they actually should, leading them to take more risks and make more mistakes that can cause accidents. Additionally, this false confidence can make the driver treat other drivers more aggressively or impulsively.

On the other hand, alcohol does not improve the visual field or attention levels. In fact, it negatively affects the ability to see traffic signs and lights, calculate distances, and can cause glare and distractions. Furthermore, alcohol decreases the ability to coordinate movements and increases reaction time, which raises the likelihood of making poor decisions while driving.