Tidal flow lane control signs and signals
Updated 5 December 2023
Applies to England, Scotland and Wales
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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.
Lane control on road leading from a junction ahead in the direction shown.
Lane control on road ahead.
Special signs explain what the signals mean.
The lane control signals are displayed above the road to indicate the availability of the various lanes. 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.
Alternative design of green arrow.
Alternative design of white diagonal arrow.
Alternative design of red cross.
End of controlled section.