**Depression** is a condition that can significantly affect a person's ability to drive safely. When a person is under the effects of depression, they may experience a **loss of environmental information**. This means their ability to concentrate and process what is happening around them is reduced.

- Depression can lead to a **lack of concentration**, which increases the risk of traffic accidents. This is because the driver may not be fully attentive to traffic signals, other vehicles, or pedestrians.

- Additionally, it is important not to drive during periods of severe depression and to follow appropriate medical treatment, as this can help mitigate the negative effects on driving.

In summary, depression affects a driver's ability to perceive and react appropriately to their environment, which can compromise road safety.