If you see a passenger car whose driver sounds the horn intermittently while an occupant waves a handkerchief out of the window, what situation is it signaling?

Question

DentroTest · Accepted Answer

When, due to especially serious circumstances, the driver of a non-priority vehicle is forced, with no other means available, to perform a service of the kind reserved for priority vehicles, the driver must try to make other users notice the situation: by using the horn intermittently and the hazard light, if the vehicle has one, or by waving a handkerchief or a similar method (General Traffic Regulations, Article 70(1)). Other users must make way for it. Therefore, it is neither an immediate overtaking maneuver nor the signal of a serious mechanical breakdown.

If you see a passenger car whose driver sounds the horn intermittently while an occupant waves a handkerchief out of the window, what situation is it signaling?

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