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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.

Other Construction Signs

No Passing Zone (W14-3) - pennant (isosceles triangle) yellow with black construction sign: You are entering a no-passing zone

No Passing Zone

W14-3

Road Work Ahead (W20-1) - diamond orange with black construction sign: Construction or maintenance work is ahead

Road Work Ahead

W20-1

Detour (W20-2) - rectangle (horizontal) orange with black construction sign: Follow the detour route to bypass a closed section of road

Detour

W20-2

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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Road Machinery Ahead Meaning 2026 - DMV Test Guide & Free Practice | DMV IQ