On roads divided into **three carriageways**, the central carriageway may be designated for traffic in **both directions or in a single direction**, depending on what the **signage** indicates. This means that the direction of traffic on the central carriageway is not fixed and can vary according to traffic needs and specific indications in each case.

- **Signage**: It is crucial to pay attention to traffic signs, as these will determine whether the central carriageway is used for one direction or both. Signage is what regulates and organizes the flow of vehicles in these situations.

- **Flexibility in lane use**: The possibility of using the central carriageway in both directions or in just one allows for more efficient traffic management, adapting to the specific conditions and needs of each moment.

Therefore, it is always important to observe and follow the indications of traffic signs to know how to drive on the central carriageway of a road with three carriageways.