This overhead signal shows a red cross above a lane, meaning that lane is closed and must not be entered.
It works together with the green arrow signal as part of a tidal flow system that reverses lane direction at different times.
What this sign means
A red cross means the lane below it is closed to traffic, usually because it is being used by traffic travelling the other way.
Driving in a lane marked with a red cross is dangerous, as vehicles may be approaching from the opposite direction.
What to do when you see it
Move out of the lane in good time before reaching the point where the closure begins.
- Check your mirrors and signal before changing lanes
- Never enter or remain in a lane showing a red cross
- Watch for other drivers who may be merging suddenly
- Allow extra time if your usual lane is closed at busy periods
How this sign is tested
This sign may be tested alongside the green arrow to check your understanding of how tidal flow lanes operate.
Questions may ask what action to take when a lane you are travelling in shows a red cross ahead.
Common mistakes
Drivers occasionally misread the red cross as a general warning rather than a lane closure instruction.
A serious mistake is delaying too long before moving out of a closing lane, risking a head-on hazard.
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Practise road sign questionsFrequently asked questions
What should I do if I am already in a lane showing a red cross?
You should move out of that lane as soon as it is safe to do so, well before reaching the closure point.
Is it illegal to drive in a lane marked with a red cross?
Yes, entering a lane closed by a red cross signal is prohibited and highly dangerous.
Why are tidal flow lanes used?
They help manage traffic efficiently by allocating extra lanes to the busier direction at peak times.