Slow Signs
The purpose of the MUTCD W41-3 Slow sign is to alert drivers to reduce their speed due to potential hazards or changing conditions ahead, such as roadway work zones, pedestrian crossings, or congested traffic areas. The Slow sign typically features the word SLOW in bold capital letters on a diamond shaped reflective background, often with a bright color like yellow or orange to ensure high visibility.
Slow Sign Details:
- 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 in our catalog on page 23.
In Stock - Usually ships same or next business day.
High Intensity Prismatic Reflective on .080" Aluminum:
MATERIAL | SIZE | PRICE PER SIGN | ADD TO CART | Catalog Part # | ||
---|---|---|---|---|---|---|
1 to 4 | 5 to 9 | 10 + | ||||
![]() High Intensity Prismatic | 24" x 24" | $72.60 | $68.97 | $65.34 | W41-3-2424-HIP | |
30" x 30" | $97.90 | $93.01 | $88.11 | W41-3-3030-HIP | ||
36" x 36" | $163.79 | $155.60 | $147.41 | W41-3-3636-HIP | ||
48" x 48" | $244.20 | $231.99 | $219.78 | W41-3-4848-HIP |
Fluorescent Yellow Prismatic Reflective on .080" Aluminum:
MATERIAL | SIZE | PRICE PER SIGN | ADD TO CART | Catalog Part # | ||
---|---|---|---|---|---|---|
1 to 4 | 5 to 9 | 10 + | ||||
![]() Fluorescent Yellow Prismatic | 24" x 24" | $80.85 | $76.81 | $72.77 | W41-3-2424-FYP | |
30" x 30" | $117.81 | $111.92 | $106.03 | W41-3-3030-FYP | ||
36" x 36" | $179.08 | $170.13 | $161.17 | W41-3-3636-FYP | ||
48" x 48" | $308.44 | $293.02 | $277.60 | W41-3-4848-FYP |
Available Reflective Finishes:
High Intensity Prismatic Reflective | Fluorescent Yellow Prismatic Reflective |
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Sign Posts
Sign Installation Hardware
Other Miscellaneous Warning Signs

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Specifications:
Legend: | SLOW |
MUTCD Sign Code #: | W41-3 |
Shape: | Diamond |
Color: | BLACK on YELLOW |
Available Sizes and Weights: | Size: 24" x 24"; Ship Weight: 5 lbs |
Size: 30" x 30"; Ship Weight: 7.8 lbs | |
Size: 36" x 36"; Ship Weight: 11.2 lbs | |
Size: 48" x 48"; Ship Weight: 19.9 lbs | |
Available Styles: | High Intensity Prismatic Reflective on .080" Aluminum |
Fluorescent Yellow Prismatic Reflective on .080" Aluminum | |
Full Description: | W41-3 have a yellow background color. The text and border are black and it is in the shape of a diamond. |
Mounting Hole Placement: | ![]() |
Slow Sign Photos:

Pictured: A Slow street sign is shown on an optional u-channel highway post.
Example Use:
In the vicinity of St. John's Medical Center, local authorities recognized the increased risks associated with fast-moving vehicles, especially given the frequent pedestrian movement of patients, staff, and visitors. To ensure the safety of all, they installed prominent 'SLOW' signs complemented . Placed strategically at intervals leading up to the hospital, these signs serve as both a visual cue and a reminder for drivers to reduce their speed.