Driving at an **excessive or inappropriate speed** increases the risk of having a **traffic accident** for several reasons:

- **Inappropriate speed**: Even if you are within the permitted limits, if the weather conditions, the road, or the driver's condition are not optimal, the speed can be dangerous. For example, driving at 70 km/h on an icy road is risky because the vehicle may skid.

- **Difficulty in reacting**: The higher the speed, the more difficult it is to react to unforeseen events, which increases the likelihood of making mistakes that can be fatal.

- **Tunnel vision**: Driving fast reduces the ability to see what is happening on the sides, limiting vision to what is directly in front, as if you were in a tunnel.

- **Fatigue and aggressiveness**: High speed over prolonged periods can cause fatigue and aggressiveness, affecting vehicle control.

- **Erroneous perception of speed**: On roads in good condition, you may feel that you are going slower than you actually are, which can lead to exceeding the speed without realizing it.

In summary, driving at a speed that does not match the conditions of the environment or the driver significantly increases the risk of accidents.