W3-3 Signal Ahead
Warns with the traffic-signal symbol that a traffic control signal is ahead, giving drivers advance notice to be prepared to stop at the signal.
- Sign Name
- Signal Ahead
- MUTCD Code
- W3-3
- Sign Category
- Warning Signs
Specifications
- Shape
- Diamond
- Color / legend
- Orange background, black signal symbol (temporary traffic control use)
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 are side lengths of the diamond, not its corner-to-corner span.
- Layout 118" × 18"
- Layout 230" × 30"
- Layout 336" × 36"
- Layout 448" × 48"
When & Where It's Used
- Advance warning of a temporary traffic signal
- Signals obscured by work activity or new signal installations
- One-lane, two-way operations under temporary signal control
Placement Context
- Where it sits
- Advance warning area, ahead of the work.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 2B — Regulatory Signs, Barricades, and Gates
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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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