To perform a maneuver safely, it is essential to follow the **R.S.M. safety rule.** This rule consists of three steps: **observe the road**, **signal the maneuver**, and **execute the maneuver**.

- **Observe the road**: Before starting any maneuver, you must carefully look at the traffic and the road, both directly and through the rearview mirrors. This ensures that you can perform the maneuver safely.

- **Signal the maneuver**: Once you have verified that it is safe, you must **inform other drivers** of your intention to perform the maneuver. You can do this using the vehicle's light signals or with your arm. It is crucial that these signals are made **with sufficient advance notice** so that other drivers have time to react appropriately. Arm signals should be made just before starting the maneuver, ensuring they are visible to others.

- **Execute the maneuver**: After observing and signaling, you can proceed to perform the maneuver. You must do it correctly, at an appropriate speed, and without endangering other vehicles or pedestrians.

In summary, signaling with **sufficient advance notice** is essential to ensure the safety of all road users, allowing other drivers to prepare and adjust their driving accordingly.