Correct answer
Only when they can be clearly seen.
Signals that drivers give with their arm are valid and can be used to communicate manoeuvre intentions, but they are only effective and legal if they can be clearly seen. This means they must be clear, visible and understandable to other road users. These hand signals are particularly useful in situations where the vehicle's light signals are not working or are not visible.
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Only when they can be clearly seen.
Only if they are used on urban roads.
Only if they are used during the day.
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