Correct answer
Blue.
Blue, with one or more lamps approved under UNECE Regulation 65. It does not depend on whether the service is police, medical or firefighting. It is a special emergency signal, distinct from ordinary lighting. Priority status and use of warnings are also governed by Articles 67 and 68 of the General Traffic Regulations.
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Blue.
Red for ambulances and blue for police, as the general rule.
Any colour chosen by the driver.
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