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

Explanation: 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.

Category: Hazard awareness

References: The Official DVSA Guide to Driving: Section 11, Highway Code: Rule 258, Highway Code: Page 102, Know Your Traffic Signs: Page 121