C23BP(CA) · Highway Widening
C23BP(CA) Sizes & Dimensions
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. All dimensions below are in inches.
Open C23BP(CA) Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
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.
- Layout 1Variable width × 18" height
See layout variant and applicable MUTCD size-selection requirements.
Dimensions transcribed from the linked layout; no roadway minimum is inferred.
- Layout 2Variable width × 24" height
See layout variant and applicable MUTCD size-selection requirements.
Dimensions transcribed from the linked layout; no roadway minimum is inferred.
Drawing dimensions are not a universal minimum or an agency approval. 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.
California Application & Variants
This is the ROAD (STREET) WORK informational plaque referred to as C23B(CA) in CA MUTCD Section 6H.03. HIGHWAY WIDENING is an example message, not the only permitted wording. Messages must use terms common to motorists, and the plaque width must not exceed the overall width of W20-1.
Official References
- C23BP(CA) — Caltrans specification drawing (opens in a new tab)
- C23BP(CA) — CA MUTCD 2026 Chapter 6H — TTC Zone Warning Signs, PDF page 2 (opens in a new tab)
- California MUTCD (Caltrans) (opens in a new tab)
- Federal MUTCD — 11th Edition (FHWA) (opens in a new tab)
- Caltrans Sign Charts (opens in a new tab)
- FHWA Standard Highway Signs (opens in a new tab)
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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