Under what circumstances can a priority vehicle exclusively use the luminous signal while on urgent service?

Question

DentroTest · Accepted Answer

Priority vehicles (such as ambulances, police, or fire trucks) must generally use both the luminous signal (blue lights V-1) and the acoustic signal (siren) simultaneously when on urgent service. However, Traffic Regulations allow for an exception: they may use only the luminous signal when omitting the acoustic signals does not pose any danger to other road users. This is common, for example, during night hours to reduce noise pollution or on clear roads.

Under what circumstances can a priority vehicle exclusively use the luminous signal while on urgent service?

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