Correct answer
To warn other road users that the vehicle is going to reverse
It warns that the vehicle is reversing or about to reverse, and also illuminates the road behind. It is white and faces rearward. It does not confer priority or permit reversing where prohibited; the driver must check the manoeuvre can be performed safely.
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To warn that the vehicle is going to park in a prohibited place
To warn that the vehicle is going to stop
To warn other road users that the vehicle is going to reverse
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