The **deceleration lane** is a type of lane specifically designed for vehicles to **reduce their speed** when exiting a motorway or highway. This lane allows drivers to safely decrease their speed before merging onto a new road, which may have lower speed limits.

- **Main function**: Facilitate the exit from a high-speed road, such as a motorway, allowing vehicles to reduce their speed in a controlled and safe manner.

- **Precautions when using it**:
- Position yourself in the lane closest to the exit before entering the deceleration lane.
- Enter the deceleration lane as soon as possible.
- Drive more slowly within this lane.
- Pay attention to the conditions of the new road you are entering, as it may require a lower speed.

Therefore, the deceleration lane is not intended for slow-moving vehicles or for overtaking on the right, but for **reducing speed when exiting the motorway**.