**Alcohol** is a factor that negatively influences driving, even if consumed in small amounts. Although a person may be below the legal blood alcohol limit, alcohol can affect their ability to drive safely.

- **Effects on behavior:** Alcohol can create a **false sense of security**, leading to taking more risks and making more mistakes that can cause accidents. It can also make the driver act more **aggressively or impulsively** towards other drivers.

- **Effects on environmental perception:** Alcohol affects **vision**, making it difficult to read traffic signs and signals, and worsening the ability to judge distances. It also reduces the ability to see what is happening on the sides and increases the risk of **glare** from other vehicles' lights.

- **Effects on movements and decisions:** Alcohol impairs the **coordination** of movements and increases the time needed to **react**. This raises the likelihood of making poor decisions or not knowing how to execute them correctly.

- **Personal factors:** The way alcohol affects a person can vary according to their **weight**, **gender**, **age**, and other personal circumstances. For example, it affects more those who are thin, women, individuals under 18, and those over 65 years old.

In summary, alcohol affects multiple critical aspects for safe driving, making it dangerous to drive even with low levels of alcohol in the body.