W4-5aP No Merge Area (Plaque)
Warns that an entering roadway has an abrupt merge without an acceleration lane.
- Sign Name
- No Merge Area (Plaque)
- MUTCD Code
- W4-5aP
- Sign Category
- Warning Signs
Specifications
- Shape
- Rectangle
- 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; drawing sizes alone do not establish a permitted minimum.
- Official drawing size18" × 24"
- Official drawing size24" × 30"
California Application & Variants
Use below the applicable Merge or Entering Roadway Merge sign. It may also be used below Yield Ahead and/or YIELD at a yield-controlled channelized right turn without an acceleration lane when engineering judgment supports it.
When & Where It's Used
- Roadway geometry and traffic-control review
Placement Context
- Where it sits
- Select placement using the actual approach, sight distance, applicable California manual provisions, and responsible agency requirements..
- CA MUTCD reference
- CA MUTCD 2026 §2C.45
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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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