Slow Moving Vehicle Signs
The MUTCD W21-4 Slow Moving Vehicle Sign is a warning sign used to indicate the presence of slow-moving vehicles, such as tractors or construction equipment, on the road. Its purpose is to alert drivers to be cautious and prepared to adjust their speed, ensuring safe navigation and reducing the risk of collisions.
Slow Moving Vehicle Sign Details:
- Slow Moving Vehicle Sign is manufactured on durable rust-proof .080" aluminum
- Pre-punched 3/8" mounting holes in top and bottom for easy installation.
- Meets M.U.T.C.D. specifications for highway use.
- See Slow Moving Vehicle Signs in our catalog on page 58.
In Stock - Usually ships same or next business day.
High Intensity Prismatic Reflective on .080" Aluminum:
MATERIAL | SIZE | WORDING | PRICE PER SIGN | ADD TO CART | Catalog Part # | ||
---|---|---|---|---|---|---|---|
1 to 2 | 3 to 5 | 6 + | |||||
![]() High Intensity Prismatic |
36" x 18" | Slow Moving Vehicle | $72.71 | $65.44 | $61.80 | W21-4-3618-HIP |
Fluorescent Orange Prismatic Reflective on .080" Aluminum:
MATERIAL | SIZE | WORDING | PRICE PER SIGN | ADD TO CART | Catalog Part # | ||
---|---|---|---|---|---|---|---|
1 to 2 | 3 to 5 | 6 + | |||||
![]() Fluorescent Orange Prismatic |
36" x 18" | Slow Moving Vehicle | $84.59 | $76.13 | $71.90 | W21-4-3618-FLO |
Available Reflective Finishes:
High Intensity Prismatic Reflective | Fluorescent Orange Prismatic Reflective |
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Related Products |
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![]() Slow Moving Vehicle W21-4 Order |

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Slow Moving Vehicle Sign Specifications:
Legend: |
SLOW MOVING VEHICLE |
MUTCD Sign Code #: |
W21-4 |
Shape: |
Horizontal Rectangle |
Color: |
BLACK on ORANGE |
Available Slow Moving Vehicle Sign Sizes and Weights: | Size: 36" x 18"; Ship Weight: 5.6 lbs |
Available Styles: | High Intensity Prismatic Reflective on .080" Aluminum |
Fluorescent Orange Prismatic Reflective on .080" Aluminum | |
Full Slow Moving Vehicle Sign Description: |
Slow Moving Vehicle Signs have a orange background color. The text and border are black. Slow Moving Vehicle Signs are horizontal rectangle shaped. |