W1-10b Curve with Side Road (Alternate)
Warns of an alternate side-road arrangement on a curve.
- Sign Name
- Curve with Side Road (Alternate)
- MUTCD Code
- W1-10b
- Sign Category
- Warning Signs
Specifications
- Shape
- Diamond
- Color / legend
- Black legend and border on yellow background
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 size36" × 36"
- Official drawing size48" × 48"
California Application & Variants
Use the official W1-10b configuration only where it approximates the actual intersection and alignment. It is distinct from W1-10 and W1-10c. The displayed official face is the left-oriented example; select the orientation that matches the site.
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.09
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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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