Is it permitted to signal a maneuver with your arm?
A)No, because arms must not be extended outside the car.
B)No, you must also signal it with the indicators.
C)Yes, when the signal is perceptible to other road users.Correct
Warnings to perform a maneuver may be given with the arm, and their validity is subject to them being perceptible to other drivers and road users and being carried out in accordance with the regulations governing them.