What does the Merge sign mean?

The Merge sign (MUTCD W4-1) is a warning sign under the federal Manual on Uniform Traffic Control Devices, the national standard the states build from. Two traffic streams join ahead and drivers on both must adjust speed and position.

Source: MUTCD 11th Edition, Chapter 2C, Table 2C-1, checked 2026-09-09.

What shape and color is the Merge sign?

What a diamond means. A warning. It tells you what the road does next and obliges you to do nothing in particular, which is the distinction test writers probe most often.

What yellow means. General warning of a permanent condition ahead.

Warning signs. A diamond reports a condition and orders nothing. What you do about it is left to you, and that gap between a report and an order is what test writers keep probing.

What is the Merge sign often mistaken for?

Added Lane (W4-3), where the entering traffic gets its own lane and nobody has to merge. In a merge the lanes converge; in an added lane they stay parallel.

The Merge sign compared side by side with the Added Lane sign

Mergethis sign	Added LaneW4-3
GroupWarning signs	GroupWarning signs
ShapeDiamond	ShapeDiamond
ColorYellow background, black symbol and border	ColorYellow background, black symbol and border
What it meansTwo traffic streams join ahead and drivers on both must adjust speed and position.	What it meansA whole extra lane opens on the entry side, so joining traffic has somewhere to go and nobody has to change lanes or yield.

Which signs get mistaken for the Merge sign?

• 
  Lane EndsW4-2

  Merge (W4-1). Lane Ends puts the obligation on the lane that is disappearing.

What does the permit test ask about the Merge sign?

This question is from the practice bank, with the answer marked.

Question 1

This sign means:

1. A.Another roadway feeds into yours ahead, so make room for it(correct answer)
2. B.Your lane ends and you must move over
3. C.A passing lane is being added
4. D.Two-way traffic begins

Source: MUTCD W4-1

What are the other warning signs?

Circular Intersection (Roundabout Ahead)W2-6

Stop AheadW3-1

Yield AheadW3-2

Signal AheadW3-3

Be Prepared To StopW3-4

Reduced Speed Limit AheadW3-5

Lane EndsW4-2

Added LaneW4-3

Cross Traffic Does Not Stop plaqueW4-4P

Road NarrowsW5-1

Narrow BridgeW5-2

One Lane BridgeW5-3

All 55 warning signs on one page, or every US road sign by shape and color.

Test yourself on this sign and the rest of the set with a road signs practice test for Florida, Texas or California.

The artwork is the federal design itself, which the manual dedicates to the public domain in MUTCD 11th Edition, Part 1, Section 1D.06, checked 2026-09-09. The Interstate Shield, the 511 pictograph and the National Scenic Byway graphic are named exceptions and are not reproduced anywhere on this site.

Source: Manual on Uniform Traffic Control Devices, 11th Edition. Not affiliated with or endorsed by the Federal Highway Administration or any state agency.