R4-12 Slow Vehicles with 5 or More Following Vehicles Must Use Turn-Out
Tells slow-moving drivers with five or more following vehicles to use the turn-out.
- Sign Name
- Slow Vehicles with 5 or More Following Vehicles Must Use Turn-Out
- MUTCD Code
- R4-12
- Sign Category
- Regulatory Signs
Specifications
- Shape
- Rectangle (Horizontal)
- 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 transcribed from the exact official drawing and its size-specific artwork. Illustrated speeds, weights, fine amounts, and directional examples require project-specific selection.
- Official drawing size42" × 24"
- Official drawing size72" × 42"
California Application & Variants
California specifies five following vehicles and placement in advance of the first turn-out area. It is not intended in advance of every individual turn-out.
When & Where It's Used
- Regulatory signing review
Placement Context
- Where it sits
- California specifies five following vehicles and placement in advance of the first turn-out area. It is not intended in advance of every individual turn-out..
- CA MUTCD reference
- CA MUTCD 2026 §2B.42
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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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