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Road Machinery Ahead: What It Means & What To Do

Road Machinery Ahead (W21-3) - diamond orange with black construction sign: Heavy machinery may be operating on or near the road
MUTCD CodeW21-3
CategoryConstruction Signs
ShapeDiamond
ColorOrange with black

What Does the Road Machinery Ahead Mean?

Heavy machinery may be operating on or near the road.

About This Sign

This sign warns of construction equipment that may be moving slowly or blocking lanes.

Where you will see it

You see this sign before a work area where heavy construction equipment is operating on or near the road. The machines may be moving slowly or blocking lanes.

What to do

  • Slow down and watch for large equipment.
  • Be ready for slow-moving machines and blocked lanes.
  • Keep a safe distance from the machinery.

A common mistake

Expecting the road to look normal and staying at full speed. Heavy machines may move slowly or block lanes without much warning, so give yourself time to slow down.

What to remember for the test

Remember that this sign warns of construction equipment on or near the road. Think slow, watch for blocked lanes, and keep your distance.

Other Construction Signs

Frequently Asked Questions

What does the Road Machinery Ahead mean?

Heavy machinery may be operating on or near the road.

What shape and color is the Road Machinery Ahead?

The Road Machinery Ahead uses the Diamond shape and Orange with black coloring.

Practice Road Sign Questions

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