You’re driving on a road with several lanes. What do these signs above the lanes mean?

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You're driving on a road with several lanes. What do these signs above the lanes mean?

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On some busy roads, lane control signals are used to vary the number of lanes available to give priority to the main traffic flow. A green arrow indicates that the lane is available to traffic facing the signal. A white diagonal arrow means that the lane is closed ahead and traffic should move to the next lane on the left. A red cross means that the lane is closed to traffic facing the signal.