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Broken White Lane Line: What It Means & What To Do

Broken White Lane Line (PM-3) - broken line white pavement marking sign: Separates lanes going the same direction
MUTCD CodePM-3
CategoryPavement Markings
ShapeBroken line
ColorWhite

What Does the Broken White Lane Line Mean?

Separates lanes going the same direction. You may change lanes across it when it is safe.

About This Sign

A broken (dashed) white line separates two or more lanes of traffic moving in the same direction. You may change lanes across it when it is safe to do so.

Where you will see it

You see a broken white line between two or more lanes that carry traffic in the same direction. It marks the lanes without blocking your move from one to the other.

What to do

  • Signal and check your mirrors and blind spot before changing lanes.
  • Cross the line only when it is safe.
  • Complete the lane change smoothly.

A common mistake

Assuming the line makes a lane change safe. It only means crossing is allowed, so you must still check for other vehicles before you move.

What to remember for the test

Remember: white lines separate traffic going the same direction, and a broken white line means you may change lanes when it is safe.

Other Pavement Markings

Frequently Asked Questions

What does the Broken White Lane Line mean?

Separates lanes going the same direction. You may change lanes across it when it is safe.

What shape and color is the Broken White Lane Line?

The Broken White Lane Line uses the Broken line shape and White coloring.

Practice Road Sign Questions

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