Whose fault is this accident in Montreal?

Who made the mistake in this accident? I admit that I really do not know the answer and it is not obvious. Is it the policeman entering the car that settles down or is it the car changing lanes to let the policeman pass behind him? When an emergency vehicle arrives behind you, you must give it free passage. Even if there is a culprit in this situation, there is also bad luck in the circumstances.

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