Correct answer
Yes, if it is perceptible and follows the prescribed signals.
Yes, when the arm signal is perceptible to other road users, follows the prescribed signals and is given in good time. Vehicle light signals are generally used, or the arm if unavailable. A valid arm signal overrides a contradictory optical indication. This does not permit any gesture or a signal that others cannot perceive.
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Yes, always, even if the gesture is neither prescribed nor perceptible.
Yes, if it is perceptible and follows the prescribed signals.
No, a prescribed arm signal can never be used.
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