Correct answer
by using the light and audible signals simultaneously.
Priority vehicles, such as police, fire-fighting, civil protection, rescue and medical assistance vehicles, must warn of their presence when travelling on urgent service by using the light and audible signals simultaneously. The light signal, consisting of one or more blue devices, together with the siren, is essential for alerting other road users that they need to give way. These signals allow priority vehicles to travel quickly and without interruption to the emergency location, improving the response in critical situations and potentially saving lives. Exceptionally, priority vehicles may use only the light signal where using the audible signals could endanger other road users.
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by using the light and audible signals simultaneously.
using only the audible signal.
by using the hazard warning signal and the audible signal simultaneously.
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