Correct answer
Yes, always.
Yes. Signal the lateral movement in good time and maintain the signal until the manoeuvre ends. Signalling gives no priority: check that the lane change is safe and respect traffic in the lane you intend to enter. The duty does not depend only on seeing a vehicle behind. The rules also recognise perceptible arm signals in specified cases. If they conflict with light signals, the arm signal takes precedence.
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All options
Yes, always.
It is not compulsory, but it is advisable.
Only when you observe in the rear-view mirror that you will not inconvenience another driver.
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