What does the no left turn sign mean?
No left turn. You must not turn left at this junction.
A red circle with a left-turn arrow crossed by a red line.
What you must do
Continue ahead and follow the permitted route to reach your turning.
Where you will see it
Junctions where a left turn would be unsafe or is banned.
Easy to confuse with: No right turn
The mirror sign bans a right turn instead. See the no right turn sign.
Test yourself
The theory test asks you to recognise signs like this one. Try the road and traffic signs quiz (with an easy and a hard set), or read the signs revision notes. Source: Know Your Traffic Signs.
Other common road signs
Meaning based on Know Your Traffic Signs and The Highway Code under the Open Government Licence v3.0. The sign image is our own simplified rendering for learning. Always check the current Highway Code on gov.uk. Not affiliated with or endorsed by the DVSA.