SC20(CA) · Slow for the Cone Zone
SC20(CA) Sizes & Dimensions
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. All dimensions below are in inches.
Open SC20(CA) Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
The drawing labels horizontal dimension A and vertical dimension B. Its table lists A × B as 36 × 42 and 48 × 54 inches, although the illustration appears wider than tall. These are the tabulated dimensions; do not infer dimensions or orientation from the preview proportions. Resolve any fabrication question with Caltrans using the original specification.
- Layout 136" × 42"
See layout variant and applicable MUTCD size-selection requirements.
Dimensions transcribed as A (horizontal) × B (vertical) from the official table. The illustration proportions differ.
- Layout 248" × 54"
See layout variant and applicable MUTCD size-selection requirements.
Dimensions transcribed as A (horizontal) × B (vertical) from the official table. The illustration proportions differ.
Drawing dimensions are not a universal minimum or an agency approval. 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.
California Application & Variants
SLOW FOR THE CONE ZONE uses a black border and legend on an orange retroreflective background.
Size selection: The drawing labels horizontal dimension A and vertical dimension B. Its table lists A × B as 36 × 42 and 48 × 54 inches, although the illustration appears wider than tall. These are the tabulated dimensions; do not infer dimensions or orientation from the preview proportions. Resolve any fabrication question with Caltrans using the original specification.
Official References
- SC20(CA) — Caltrans specification drawing (opens in a new tab)
- SC20(CA) — CA MUTCD 2026 Chapter 6H — TTC Zone Warning Signs, PDF page 12 (opens in a new tab)
- California MUTCD (Caltrans) (opens in a new tab)
- Federal MUTCD — 11th Edition (FHWA) (opens in a new tab)
- Caltrans Sign Charts (opens in a new tab)
- FHWA Standard Highway Signs (opens in a new tab)
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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