W1-4b Reverse Curve (2 lanes)
Warns of a two-lane reverse-curve alignment ahead — a curve in one direction followed by a curve in the other — such as a lane shift around a work area.
- Sign Name
- Reverse Curve (2 lanes)
- MUTCD Code
- W1-4b
- Sign Category
- Warning Signs
Specifications
- Shape
- Diamond
- Color / legend
- Orange background, black legend (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 124" × 24"
- Layout 230" × 30"
- Layout 336" × 36"
- Layout 448" × 48"
When & Where It's Used
- Two-lane lane shifts around work activity
- Temporary alignment changes / crossovers
- Used with channelizing devices through the shift
Placement Context
- Where it sits
- Advance warning area, ahead of the work.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 6H — TTC Zone Warning Signs
Related Signs
Browse Warning Signs
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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