If the driver of the vehicle in front extends their arm and moves it up and down with short, quick movements, what are they indicating?

Question

DentroTest · Accepted Answer

The driver is indicating their intention to slow down considerably. This hand signal is mainly used when the brake lights are malfunctioning or to reinforce the warning to vehicles behind regarding a sudden stop. It is important to distinguish this signal from turning signals: a left turn is signaled with the arm extended horizontally, and a right turn with the arm bent upwards at a right angle (L-shape). Remember that arm signals are valid and prevail over optical signals in case of contradiction, provided they are clearly visible.

If the driver of the vehicle in front extends their arm and moves it up and down with short, quick movements, what are they indicating?

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