R89A(CA) One Vehicle per Green
Limits release from a single controlled ramp lane to one vehicle per green indication.
- Sign Name
- One Vehicle per Green
- MUTCD Code
- R89A(CA)
- California designation
- California-coded sign
- Sign Category
- Regulatory Signs
Specifications
- Shape
- Rectangle (Horizontal)
- Color / legend
- Black legend and border on white background
Sizes & Dimensions (inches)
These sizes are listed in the linked California MUTCD table. Use the applicable roadway column and confirm the approved design and fabrication details with the roadway authority.
CA MUTCD 2026 Table 2B-1(CA) lists 36 × 18 inches in both conventional-road columns. It does not specify a minimum or freeway size for this entry. The artwork is from Figure 2B-29(CA); a standalone dimensioned drawing is not linked. Confirm approved fabrication details with the roadway authority.
- Conventional roads — single and multi-lane36" × 18"
California Application & Variants
California replaces the federal R10-28 designation with R89A(CA) for this single-controlled-lane application. CA MUTCD 2026 Table 2B-1(CA) lists 36 × 18 inches in both conventional-road columns. It does not specify a minimum or freeway size for this entry. The artwork is from Figure 2B-29(CA); a standalone dimensioned drawing is not linked. Confirm approved fabrication details with the roadway authority.
When & Where It's Used
- Single-lane ramp metering
Placement Context
- Where it sits
- At the applicable ramp-meter signal for the controlled lane.
- CA MUTCD reference
- CA MUTCD 2026 §2B.61
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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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