OM1-1 Object Marker Type 1
A Type 1 object marker using yellow reflectors on a yellow diamond-shaped panel to mark an obstruction. It highlights the object's location rather than giving a travel direction.
- Sign Name
- Object Marker Type 1
- MUTCD Code
- OM1-1
- Sign Category
- Object Markers
Specifications
- Shape
- Diamond
- Color / legend
- Yellow reflectors on a yellow panel
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.
- Layout size18" × 18"
Placement Context
- Where it sits
- At the obstruction being marked, per CA MUTCD Chapter 2C.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 2C — Warning Signs and Object Markers
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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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