In the absence of light signals, how must a driver warn with their arm of their intention to immobilize the vehicle or slow down considerably?

Question

DentroTest · Accepted Answer

According to General Traffic Regulations, when brake lights are not working or the driver wishes to reinforce the warning, they must extend their left arm out the window and move it alternately up and down with short, quick movements. This signal is universal for indicating speed reduction. It is important not to confuse this with extending the arm horizontally (left turn) or bending it upwards at an angle (right turn).

In the absence of light signals, how must a driver warn with their arm of their intention to immobilize the vehicle or slow down considerably?

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