R4-18 Do Not Pass on Shoulder
Informs drivers that using the shoulder to pass another vehicle is prohibited.
- Sign Name
- Do Not Pass on Shoulder
- MUTCD Code
- R4-18
- 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 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 size18" × 24"
- Official drawing size24" × 30"
- Official drawing size36" × 48"
- Official drawing size48" × 60"
California Application & Variants
Match the sign to the shoulder and the actual regulated movement. It is distinct from the broader DO NOT DRIVE ON SHOULDER sign.
When & Where It's Used
- Regulatory signing review
Placement Context
- Where it sits
- Match the sign to the shoulder and the actual regulated movement. It is distinct from the broader DO NOT DRIVE ON SHOULDER sign..
- CA MUTCD reference
- CA MUTCD 2026 §2B.43
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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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