If you see a vehicle traveling while sounding its horn intermittently and an occupant waving a handkerchief out of the window, what situation is it signaling?

Question

DentroTest · Accepted Answer

According to the General Traffic Regulations, when a non-priority vehicle (such as a private passenger car) must exceptionally carry out an emergency service to take a seriously ill or injured person to a medical center, its driver must warn of their presence. To do so, they will use the hazard lights and intermittent sound signals with the horn, or else wave a handkerchief or cloth out of the window. Other road users must make way for them as far as possible, although these vehicles do not have automatic priority and must obey traffic signs.

If you see a vehicle traveling while sounding its horn intermittently and an occupant waving a handkerchief out of the window, what situation is it signaling?

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