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Slower Traffic Keep Right: What It Means & What To Do

Slower Traffic Keep Right (R4-3) - rectangle (vertical) white with black/red regulatory sign: Vehicles traveling slower than the normal speed of traffic should use the right lane
MUTCD CodeR4-3
CategoryRegulatory Signs
ShapeRectangle (vertical)
ColorWhite with black/red

What Does the Slower Traffic Keep Right Mean?

Vehicles traveling slower than the normal speed of traffic should use the right lane.

About This Sign

This sign reminds slower-moving vehicles to move to the right lane, allowing faster traffic to pass on the left.

Where you will see it

You see this sign on multilane roads where slower vehicles may hold up faster ones. It reminds drivers going slower than the normal speed of traffic where to position themselves.

What to do

  • Drive in the right lane if you are slower than the normal speed of traffic.
  • Leave the left lane for faster vehicles to pass.
  • Move right and let faster drivers go by.

A common mistake

Drivers cruise in the left lane at a slow pace and block those behind them. The left lane is for passing, not for staying put.

What to remember for the test

Remember that the instruction is about relative speed: slower than the normal flow of traffic belongs in the right lane.

Other Regulatory Signs

Frequently Asked Questions

What does the Slower Traffic Keep Right mean?

Vehicles traveling slower than the normal speed of traffic should use the right lane.

What shape and color is the Slower Traffic Keep Right?

The Slower Traffic Keep Right uses the Rectangle (vertical) shape and White with black/red coloring.

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