ThinkabaraMerge sign
Warning signs · MUTCD W4-1
What it means
Two lanes of traffic will join into one ahead.
How to recognize it
Yellow diamond with two lines joining.
What drivers do
Drivers on both roads should adjust speed and take turns so traffic can merge smoothly.
Check yourself
What does a MERGE sign warn about?
Learning summary, not legal advice. Traffic laws vary by state — check your state driver's handbook. Drawing: our own illustration of the standard MUTCD design.
Frequently asked questions
What does the Merge sign mean?
Two lanes of traffic will join into one ahead.
What should a driver do at a Merge sign?
Drivers on both roads should adjust speed and take turns so traffic can merge smoothly.
What does the Merge sign look like?
Yellow diamond with two lines joining. It is a warning sign (yellow). MUTCD code W4-1.