W3-5 Reduced Speed Limit Ahead
Warns that a lower posted speed limit begins ahead.
- Sign Name
- Reduced Speed Limit Ahead
- MUTCD Code
- W3-5
- Sign Category
- Warning Signs
Specifications
- Shape
- Diamond
- Color / legend
- Black arrow on yellow with black-and-white speed-limit panel
Sizes & Dimensions (inches)
These are dimensions shown on the linked layout. Select the required size using the applicable MUTCD and agency requirements; the smallest drawing size is not necessarily the permitted minimum.
Dimensions verified against the official drawing. Diamond dimensions are nominal side lengths. Select the required application size from the California manual, not simply the smallest available drawing.
- Official drawing size30" × 30"
- Official drawing size36" × 36"
- Official drawing size48" × 48"
California Application & Variants
The displayed speed is an example and must match the subsequent Speed Limit sign. This advance warning does not itself establish the speed-limit boundary.
When & Where It's Used
- Roadway geometry and approach-warning review
Placement Context
- Where it sits
- In advance of the condition, with placement determined from the approach speed, sight distance, and applicable California manual provisions..
- CA MUTCD reference
- CA MUTCD 2026 §2C.40
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Educational reference only. This is not an official Caltrans, FHWA, or local agency publication and is not legal or engineering advice. Always verify sign selection, size, placement, spacing, and application against the current CA MUTCD 2026, Caltrans sign specifications, Standard Plans, project documents, and the reviewing agency’s requirements. Local jurisdictions may impose additional requirements, and final selection, placement, and dimensions may require engineering judgment or agency approval. Reference editions: California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition with Revision 1.
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