**Stress** negatively affects a driver's behavior. When a person is stressed, their **mood** can change drastically, which can lead to a **loss of concentration**. This increases the risk of having a traffic accident.

- Stress can make the driver become **more aggressive and reckless**. This is because stress can increase **irritability** and **nervousness**, which can lead to more impulsive and less controlled behavior behind the wheel.

- Additionally, stress can affect the ability to make appropriate decisions, as the driver may have **difficulty concentrating** and reacting appropriately to traffic situations.

Therefore, it is important for drivers to manage their stress to maintain safe and responsible behavior on the road.