Regulatory sign
One-way traffic sign
What does the One-way traffic sign mean?
Traffic on this road may only travel in the direction of the arrow. Choose your lane early, as traffic may pass on both sides.
Also known as: One-way street sign, One way sign
What it means
The road is one-way, in the direction of the arrow. You must not drive against it.
In a one-way street, traffic could pass you on both sides. Unless signs or markings say otherwise, use the left lane to turn left, the right lane to turn right and the most suitable lane to go straight on.
Buses or cycles may have a contraflow lane running the other way, so look out for them.
Rules to know
In a one-way street, traffic must travel in the direction indicated by signs.
The Highway Code, Rule 143
Buses and/or cycles may have a contraflow lane.
The Highway Code, Rule 143
The sign is listed among regulatory signs as 'One-way traffic'.
Know Your Traffic Signs, p. 20
Common mistakes
Mistake: Expecting traffic to pass only on your right.
Instead: In a one-way street, traffic could pass on both sides.
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© Crown copyright. Free to reuse under the Open Government Licence v3.0, as long as the sign is reproduced accurately and not in a misleading context.
Related signs
See also
No entry
Regulatory sign
Stops traffic entering a road the wrong way.
More regulatory signs
All regulatory signsSources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Regulatory signs, p. 20
- The Highway Code, Rule 143
Sign image: Department for Transport, Traffic sign images (diagram 652). © Crown copyright, reused under the Open Government Licence v3.0.
Checked against these sources and reviewed by Bikash Thapa, full UK driving licence holder. Last reviewed 4 October 2026. This page explains the sign in our own words; for the full rules, see The Highway Code. How we source and check content