To merge into traffic safely, it is essential **to ensure that the maneuver does not pose a danger to other road users**. This involves following the **R.S.M. safety rule**, which consists of observing, signaling, and executing the maneuver correctly.

- **Observe**: Before entering a road, it is crucial to observe the traffic and ensure there is enough space to merge without interfering with other vehicles.
- **Signal**: It is important to inform other drivers of the intention to merge, using turn signals or the arm to indicate the maneuver.
- **Execute the maneuver**: When merging, it should be done at an appropriate speed and without becoming an obstacle for vehicles already on the road. Additionally, it is necessary to yield if required, stopping at the beginning of the acceleration lane until it is safe to enter.

Drivers already on the road also have the responsibility to facilitate the merging of other vehicles, especially larger ones or those carrying many people, such as buses at designated stops. This can be achieved by moving to the side or reducing speed.

In summary, the key to merging into traffic is **to ensure that the maneuver is carried out without danger to other users**, following the guidelines of observation, signaling, and safe execution.