Traffic merging from left sign

What it means

Another road or slip road joins yours from the left ahead, and its traffic will merge with yours.

The angled line joining from the left shows traffic merging, not a junction where it has to stop.

Check your mirrors and adjust your speed, or move to another lane if it is safe, to let joining traffic in.

Where you'll see it

Before slip roads and other roads that join at a shallow angle, often on dual carriageways.

Rules to know

• The sign warns that traffic merges from the left.

  Know Your Traffic Signs, p. 10

• If you need to change lane, first use your mirrors, and signal when it is safe to do so.

  The Highway Code, Rule 133

Common mistakes

• Mistake: Treating it as an ordinary side road.

  Instead: Merging traffic joins at speed and needs room to move into your lane. Be ready to adjust your speed.

Test yourself

Recalling the answer helps it stick. Pick an answer to see how you did.

Question 1 of 2

What does this sign mean?

• ATraffic merging from the left ahead
• BWarns that the road narrows on both sides ahead.
• CWarns of a zebra or parallel crossing ahead.
• DWarns of a side road joining your road ahead.

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