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In this situation, I should:

The blue vertical sign indicates that, under normal conditions, we would have priority of passage in this road narrowing. However, the vehicle approaching from the opposite direction is an ambulance signaling an urgent emergency journey with its flashing lights. Priority vehicles on urgent emergency service have priority of passage over other road users, which overrides the priority indication given by the information sign. For this reason, we must give way to the ambulance. The other options are incorrect because we cannot proceed first in front of a priority vehicle on an emergency mission, nor is there an obligation to stop if it is possible to facilitate passage in another way.