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Merge: What It Means & What To Do

Merge (W4-1) - diamond yellow with black warning sign: Two lanes of traffic are merging into one
MUTCD CodeW4-1
CategoryWarning Signs
ShapeDiamond
ColorYellow with black

What Does the Merge Mean?

Two lanes of traffic are merging into one. Be prepared to allow vehicles to merge.

About This Sign

The merge sign warns that traffic from another road will join your lane ahead.

Where you will see it

You meet this sign where two lanes of traffic come together into one, such as where a road joins another or a lane combines with yours.

What to do

  • Check your mirrors and match the speed of traffic.
  • Let merging vehicles in when you can do so safely.
  • Do not speed up to block a vehicle that is merging.

A common mistake

Drivers sometimes refuse to let others in, or brake suddenly at the last second. Merging works best when everyone adjusts speed early and takes turns.

What to remember for the test

This sign warns of two lanes joining into one. Remember that you should be ready to let other vehicles merge, not just watch your own lane.

Commonly Confused With

Other Warning Signs

Frequently Asked Questions

What does the Merge mean?

Two lanes of traffic are merging into one. Be prepared to allow vehicles to merge.

What shape and color is the Merge?

The Merge uses the Diamond shape and Yellow with black coloring.

Practice Road Sign Questions

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