R9-23b Bicycle Left Turn Must Use Turn Box
Requires the bicycle left turn to use the designated two-stage turn box.
- Sign Name
- Bicycle Left Turn Must Use Turn Box
- MUTCD Code
- R9-23b
- Sign Category
- Regulatory Signs
Specifications
- Shape
- Rectangle (Vertical)
- Color / legend
- Black legend and border on white background
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.
Dimensions checked against the exact official drawing. Select by the applicable roadway or bicycle-facility requirements; displayed hours, fees, and other variable legends are examples.
- Official drawing size12" × 18"
California Application & Variants
Mount this near-side sign at the intersection where use of the turn box is required. Use the appropriate advance R9-23 or R9-23a sign as well.
When & Where It's Used
- Pedestrian and bicycle route review
Placement Context
- Where it sits
- Near side of the intersection at the mandatory two-stage bicycle turn box..
- CA MUTCD reference
- CA MUTCD 2026 §9B.18
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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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