Correct answer
To prohibit passage across the line joining them.
As a barrier device, steady or flashing amber lights prohibit crossing the imaginary line joining them, under Annex I, section 3.1.1.6. Do not assign that meaning to every amber light on the road: an amber traffic signal or vehicle beacon has its own rules. The question concerns lights arranged as a closure barrier.
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To indicate the presence of a sharp bend.
To indicate the edge of the carriageway.
To prohibit passage across the line joining them.
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