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Center Lane Only: What It Means & What To Do

Center Lane Only (R3-9a) - rectangle (vertical) white with black/red regulatory sign: The center lane is for left turns only
MUTCD CodeR3-9a
CategoryRegulatory Signs
ShapeRectangle (vertical)
ColorWhite with black/red

What Does the Center Lane Only Mean?

The center lane is for left turns only. Never use it to pass or to travel through traffic.

About This Sign

The center lane is only used for vehicles turning left, and should never be used for passing or moving through traffic. The only time a vehicle should enter the center lane is at a point where the vehicle will have time to slow down or stop to make a safe left turn.

Where you will see it

You see this sign on a road with a center lane, usually between lanes of opposing traffic. It tells you the center lane is used for left turns only.

What to do

  • Use the center lane only to make a left turn.
  • Enter it only where you have time to slow down or stop for a safe turn.
  • Never use it to pass or to drive through.

A common mistake

Using the center lane as a passing lane or a place to speed ahead of traffic. It is meant only for vehicles turning left, so entering it far from the turn is unsafe.

What to remember for the test

Remember: center lane means left turns only. Never use it to pass or to travel through traffic, and enter it only where you can slow down for the turn.

Other Regulatory Signs

Frequently Asked Questions

What does the Center Lane Only mean?

The center lane is for left turns only. Never use it to pass or to travel through traffic.

What shape and color is the Center Lane Only?

The Center Lane Only uses the Rectangle (vertical) shape and White with black/red coloring.

Practice Road Sign Questions

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