The consumption of **alcohol** negatively affects a driver's ability to operate a vehicle safely. One of the most notable effects is that the driver becomes **more sensitive to glare**. This means that the lights of other vehicles can affect their vision more, making safe driving difficult.

- Alcohol primarily affects the **brain and vision**, which can cause the driver to be more easily dazzled by the lights of other vehicles.
- Additionally, alcohol can cause the driver to see traffic signs and traffic lights worse, and have less ability to see what is happening around them.
- These effects increase the risk of accidents, as the driver may not react adequately to dangerous situations.

Therefore, it is crucial to avoid alcohol consumption before driving to maintain clear vision and an appropriate response to traffic conditions.