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Added Lane: What It Means & What To Do

Added Lane (W4-3) - diamond yellow with black warning sign: A new lane is being added
MUTCD CodeW4-3
CategoryWarning Signs
ShapeDiamond
ColorYellow with black

What Does the Added Lane Mean?

A new lane is being added. Entering traffic does not need to merge.

About This Sign

The added lane sign indicates the road is gaining a lane so entering traffic has its own lane.

Where you will see it

You meet this sign where the road gains an extra lane, often where a road joins and vehicles entering get their own lane instead of squeezing in.

What to do

  • Stay in your lane and keep a steady speed.
  • Watch for vehicles entering the new lane next to you.
  • Do not assume you have to move over for them.

A common mistake

Drivers sometimes confuse this with a merge sign and slow down or swerve. Here the entering traffic does not need to merge, so keep your lane.

What to remember for the test

Do not mix this up with Merge or Lane Ends. Added Lane means a lane is gained, and the entering traffic does not have to merge into yours.

Other Warning Signs

Frequently Asked Questions

What does the Added Lane mean?

A new lane is being added. Entering traffic does not need to merge.

What shape and color is the Added Lane?

The Added Lane uses the Diamond shape and Yellow with black coloring.

Practice Road Sign Questions

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