W4-5aP NO MERGE AREA (PLAQUE) Requirements
Application notes for W4-5aP NO MERGE AREA (PLAQUE). The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
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.
1. When NO MERGE AREA (PLAQUE) Is Used
Warns that an entering roadway has an abrupt merge without an acceleration lane.
- Roadway geometry and traffic-control review
2. Placement and Application Notes
Position W4-5aP select placement using the actual approach, sight distance, applicable California manual provisions, and responsible agency requirements..
- Place the sign where the intended road users have a clear, unobstructed view on approach.
- Use the mounting height and lateral placement specified for the sign and installation type.
- Use sign assemblies and supplemental plaques only as provided in the applicable manual and approved design.
3. Layout Sizes and Visibility Considerations
Linked-layout dimensions: 18" × 24"; 24" × 30". Check the applicable MUTCD and agency requirements for the required installation size.
- Choose size based on roadway speed, sight distance, and mounting location.
- Use the visibility and material requirements specified for this sign and installation.
4. Sign Selection Checks
- Match W4-5aP to the actual approach and traffic condition.
- 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.
- Select application size and installation using the California manual and agency requirements.
Related Resources
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Verify W4-5aP Requirements
This is an educational reference. Verify sign use, size, placement, and application against the current CA MUTCD, Caltrans sign specifications, Standard Plans, and the reviewing agency. Official source links are gathered in one place.
View official sourcesEducational 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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