To correctly perform a parking maneuver, it is essential to follow the **R.S.M. safety rule**, which establishes a specific order of actions to ensure safety.

1. **Observe the traffic**: Before any maneuver, the first thing you should do is **observe the road** using the mirrors. This allows you to be aware of the traffic and any obstacles or vehicles that may be nearby. It is crucial to ensure it is safe to proceed before taking any other action.

2. **Signal the maneuver**: Once you have checked that it is safe, the next step is to **inform other drivers** of your intention to park using the appropriate signals. This helps prevent accidents and maintain an orderly flow of traffic.

3. **Perform the maneuver**: Only after observing and signaling can you proceed to **perform the parking maneuver**.

By following this order, risks are minimized, and a safe and efficient parking maneuver is ensured. Therefore, the first action should always be to **observe the traffic**.