Correct answer
Yes, when the signal is noticeable to other road users.
A lorry driver must signal their intentions clearly, with sufficient advance notice, generally using light signals or occasionally using their arm. Exceptionally, acoustic signals and arm signals may be used to indicate the manoeuvre, provided they are noticeable to other road users. These latter signals take precedence over light signals and override any other conflicting optical signal.
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Yes, always.
No.
Yes, when the signal is noticeable to other road users.
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