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UK Road Signs

Warning sign

Traffic merges onto main carriageway sign

Traffic merges onto main carriageway warning sign: a red-bordered triangle with a road joining a wider road from the side
Sign image: Department for Transport, © Crown copyright

What does the Traffic merges onto main carriageway sign mean?

Warns that the road you are on is merging onto a main carriageway ahead. Look for a gap and merge smoothly.

Also known as: Merging traffic sign

What it means

Your road joins the main carriageway ahead.

The symbol shows your road joining a main carriageway. You will need to merge with the traffic already on it.

Match your speed to the traffic, look for a safe gap and merge in turn.

Where you'll see it

Near slip roads and junctions where one road merges into another.

Rules to know

Common mistakes

  • Mistake: Stopping at the end of the merge.

    Instead: Adjust your speed early and merge into a gap; stopping can be dangerous.

Test yourself

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Question 1 of 1

What does this sign mean?

Red-bordered white triangle with a black road shape joining a wider black road at an angle

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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.

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Sources

Sign image: Department for Transport, Traffic sign images (diagram 509.1). © Crown copyright, reused under the Open Government Licence v3.0.

Last reviewed 11 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