R3-5a Through Only
Requires drivers in this lane or approach to proceed straight through the intersection only, prohibiting turning movements.
- Sign Name
- Through Only
- MUTCD Code
- R3-5a
- Sign Category
- Regulatory Signs
Specifications
- Shape
- Rectangle (Vertical)
- Color / legend
- White background, black legend and arrow
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.
- Layout size30" × 36"
When & Where It's Used
- Requiring through movement at work-zone approaches
- Restricting turns during construction lane-use control
- Lane-use control where only straight-through travel is permitted
Placement Context
- Where it sits
- At the point where the regulation applies, per CA MUTCD Part 2B.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 2B — Regulatory Signs, Barricades, and Gates
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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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