R10-10c LEFT (RIGHT) TURN LANE SIGNAL Requirements
Application notes for R10-10c LEFT (RIGHT) TURN LANE SIGNAL. The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
California Application & Variants
Source size discrepancy: the FHWA drawing schedules show 24 × 30 and 30 × 36 inches. CA MUTCD 2026 Table 8B-1 lists 24 × 36 minimum and 30 × 42 conventional-road sizes. Confirm the required California design and dimensions with the reviewing agency before selecting or fabricating this sign.
1. When LEFT (RIGHT) TURN LANE SIGNAL Is Used
Identifies a separate signal face controlling the indicated turn lane at a grade crossing pre-signal or queue cutter signal.
- Signal control and supplemental instructions
2. Placement and Application Notes
Position R10-10c locate adjacent to the separate signal face serving the applicable turn 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: See dimensions in the official specification. 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
- The displayed face says LEFT TURN; the official drawings include both directions. Check CA MUTCD Table 8B-1 rather than assuming the smallest FHWA drawing is the California minimum.
- Use the official drawing with the applicable California manual table and reviewing agency requirements.
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Verify R10-10c 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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