Correct answer
The carriageway is open to traffic again
As well as acoustic signals with the whistle and visual signals with their arms, traffic officers may give orders from their vehicle by displaying a green flag, which means that a carriageway is open to traffic again after having been stopped or closed.
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The carriageway is open to traffic again
The carriageway is closed to traffic
Vehicles cannot make a U-turn on that carriageway
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