Here you go.
This road has been closed for a couple of weeks now (the first exit, of four, on the RAB ahead)
I think this is a common (if not entirely correct) usage of this sign. Dont forget, the workmen are not highway planners or police.
They just make it up as they go along.
I once complained about a cycletrack closure, where there were *no* early warning signs for the road closure ahead. Once the closure was in sight, the only signs refered to mopeds dismounting and a pedestrian diversion. The Police agreed with me that it was insufficient and the workmen changed the signage
Here is the pic :
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