What does holding a white handkerchief out of a car window mean in Spain

In Spain, if you see someone holding a white handkerchief out of a car window, it means the vehicle is on an emergency mission, requesting other drivers to politely yield the way .
When is this gesture used
To urgently transport a person with a severe medical condition
When the patient’s life depends on reaching the hospital in time
In cases where an ambulance cannot arrive in time
IMPORTANT: This gesture should only be used in a real life-threatening situation. Keep in mind that transporting an injured person is a huge responsibility. If things go wrong, the family might question why emergency services were not called first.
Always assess the situation carefully and call emergency services whenever possible.

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