To ensure **road safety**, it is essential to **signal** certain maneuvers while driving. These maneuvers include:

- **Lateral movements**: Changing lanes or moving to the side requires you to notify other drivers. This can be done using the vehicle's lights or arm signals.
- **Reversing**: When backing up, it is crucial that other drivers are aware of your movement to avoid accidents.
- **Immobilizing the vehicle**: Stopping on the road can surprise other drivers, so it is important to signal it.
- **Slowing down**: Significantly reducing speed must also be communicated to others to prevent collisions.

The **R.S.M. safety rule** (Observe, Signal, Maneuver) emphasizes the importance of observing the surroundings, signaling properly, and executing the maneuver safely. This ensures that the driver's actions do not pose a danger to other vehicles or pedestrians.

In summary, whenever you make a lateral movement, reverse, immobilize the vehicle, or slow down, you must signal it to maintain safety on the road.