Correct answer
With the appropriate lights or, failing that, a statutory arm signal.
Use the appropriate light signal or, failing that, a perceptible statutory arm signal. Warn sufficiently early and respect traffic priority in the lane you join. An arm signal overrides a contradictory optical indication. Signalling grants no priority and does not by itself make the manoeuvre safe.
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Only with the horn, without lights or an arm signal.
With the appropriate lights or, failing that, a statutory arm signal.
No warning is required; it is only recommended.
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