Correct answer
Yes, to warn other road users of its presence.
Yes, intermittently, with hazard lights if fitted, or a waving handkerchief or similar method. This is the exceptional warning in Article 70, not permission to fit or use a priority-vehicle siren. The driver must obey traffic rules and other road users must facilitate passage safely.
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Yes, to warn other road users of its presence.
Yes, but only on roads within a built-up area.
No, it may only use optical signals.
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