If a vehicle driver puts an arm out of the window, extending it in a horizontal position and showing the palm backward, what is the driver warning of?

Question

DentroTest · Accepted Answer

Reversing is signaled with the reversing light, if the vehicle has one, or, otherwise, by extending the arm horizontally with the palm of the hand facing backward (Article 109(2)(b) of the General Traffic Regulations). The other gestures mean something else. The arm extended horizontally with the palm down warns of a lateral movement toward the side the hand indicates, such as a left turn (Article 109(2)(a)). Moving the arm up and down with short, rapid movements warns of the intention to immobilize the vehicle or to slow it down considerably (Article 109(2)(c)).

If a vehicle driver puts an arm out of the window, extending it in a horizontal position and showing the palm backward, what is the driver warning of?

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