To facilitate the passage of a **priority vehicle in an emergency service**, it is essential to **adopt appropriate measures according to the circumstances at the time**. This means that drivers must be attentive to the siren and light signals of these vehicles and act in a way that ensures their safe and quick passage.

- **Flexibility in response:** It is not always necessary to stop or move to a specific side of the road. The action to take will depend on the situation on the road, such as traffic, the width of the road, and the presence of other vehicles or pedestrians.

- **Safety first:** Although emergency vehicles have priority and may not follow some traffic rules, it is crucial that their passage does not endanger other road users. Therefore, drivers must assess the situation and act in a way that minimizes risks.

- **Examples of appropriate actions:** In some cases, it may be necessary to move to the right and stop, but in others, simply reducing speed or changing lanes may be sufficient. The key is to be aware of the surroundings and act in a way that facilitates the passage of the emergency vehicle without causing dangerous situations.

In summary, the correct action when faced with a vehicle in emergency service is to be flexible and adapt to the circumstances at the time to ensure a safe and efficient passage.