Warning sign
Traffic merges onto main carriageway sign
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
The sign warns that traffic merges onto the main carriageway.
Know Your Traffic Signs, p. 10
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
Recalling the answer helps it stick. Pick an answer to see how you did.
Question 1 of 1
What does this sign mean?
Ready for more? Take the Warning Signs Quiz
Download this sign
© 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
Traffic merging from left
Warning sign
Traffic joins your road from the left.
See also
Dual carriageway ahead
Information sign
Another warning about the road ahead.
More warning signs
All warning signsShare this sign
Pinterest (opens in a new tab)Facebook (opens in a new tab)X (opens in a new tab)WhatsApp (opens in a new tab)EmailSources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Warning signs, p. 10
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