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Minimum Speed: What It Means & What To Do

Minimum Speed (R2-4P) - rectangle (vertical) white with black/red regulatory sign: You must travel at least the posted minimum speed unless conditions make it unsafe
MUTCD CodeR2-4P
CategoryRegulatory Signs
ShapeRectangle (vertical)
ColorWhite with black/red

What Does the Minimum Speed Mean?

You must travel at least the posted minimum speed unless conditions make it unsafe.

About This Sign

Minimum speed signs are posted on highways where slow-moving traffic could create a hazard. Vehicles unable to maintain the minimum speed should not use the road.

Where you will see it

Minimum speed signs are posted on highways where slow traffic could become a hazard. They tell you the lowest speed you may normally travel on that road.

What to do

  • Drive at least the posted minimum unless conditions make it unsafe.
  • Do not use this road if your vehicle cannot keep up that speed.
  • Go slower only when conditions make the minimum speed unsafe.

A common mistake

Most speed signs are about going too fast, so drivers forget that going too slowly can also be a violation and cause rear-end crashes.

What to remember for the test

This is the one speed sign that sets a floor instead of a ceiling. Remember the exception: you may go slower when conditions make the minimum unsafe.

Other Regulatory Signs

Frequently Asked Questions

What does the Minimum Speed mean?

You must travel at least the posted minimum speed unless conditions make it unsafe.

What shape and color is the Minimum Speed?

The Minimum Speed uses the Rectangle (vertical) shape and White with black/red coloring.

Practice Road Sign Questions

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