R89A(CA) ONE VEHICLE PER GREEN Requirements
Application notes for R89A(CA) ONE VEHICLE PER GREEN. The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
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.
1. When ONE VEHICLE PER GREEN Is Used
Limits release from a single controlled ramp lane to one vehicle per green indication.
- Single-lane ramp metering
2. Placement and Application Notes
Position R89A(CA) at the applicable ramp-meter signal for the controlled lane.
- 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: 36" × 18". 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 R89A(CA) and its displayed legend to the intended condition.
- Check the source drawing for the required directional or message variant.
Related Resources
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Verify R89A(CA) 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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