Drinking **alcohol** before driving, even in small amounts, can negatively affect your ability to operate a vehicle. Alcohol is distributed throughout the body via the bloodstream and has a significant impact on the **brain** and **vision**, which can increase the risk of traffic accidents.

The **blood alcohol concentration (BAC)**, which is the amount of alcohol in the blood, varies according to several factors, such as **weight**, **gender**, **age**, and **personal circumstances**. For example, alcohol affects thin people, women, those under 18, and those over 65 more. Additionally, drinking alcohol without eating or doing so quickly can increase the BAC.

Although there are legal BAC limits for driving, the only completely safe level is **0.0**, meaning no alcohol consumption. This is because any amount of alcohol can impair the ability to drive safely.