R9-21 Bicycles Use Shoulder Only
Directs allowed bicycle traffic to remain on the shoulder.
- Sign Name
- Bicycles Use Shoulder Only
- MUTCD Code
- R9-21
- 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 size24" × 30"
California Application & Variants
Limit use to freeways or expressways where bicycles are allowed and the shoulder is available and usable. Place near the point where the full-width shoulder resumes beyond an entrance-ramp taper.
When & Where It's Used
- Pedestrian and bicycle route review
Placement Context
- Where it sits
- At the location and facing the approach identified by the linked manual; match any directional arrow to the actual assembly..
- CA MUTCD reference
- CA MUTCD 2026 §9B.16
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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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