This guide summarizes the MUTCD requirements and practical application guidance for the OM1-3 OBJECT MARKER (TYPE 1) sign. Use this resource to understand when it is required, how to place it correctly, and how to maintain clear visibility for safe operations.
Marking obstructions near the traveled way
At (or leading up to) the obstruction it marks, per CA MUTCD object-marker standards.
Mount at the standard height and setback for the roadway with clear sight lines.
High reflectivity and clear sight lines are essential day and night.
Marks an obstruction or hazard within or adjacent to the roadway, using a high-contrast pattern to make the object visible day and night.
Marks an obstruction or hazard within or adjacent to the roadway, using a high-contrast pattern to make the object visible day and night. In the field, OM1-3 Object Marker (Type 1) is typically positioned at the at (or leading up to) the obstruction it marks, per ca mutcd object-marker standards. Common deployments include marking obstructions near the traveled way; delineating equipment and fixed hazards; supplementing channelizing devices. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
At (or leading up to) the obstruction it marks, per CA MUTCD object-marker standards.
Typical minimum: Per CA MUTCD object-marker standards.
Used in California to mark fixed objects, equipment, or hazards near the traveled way in and around work zones.
Go to California NotesEducational 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. Written against California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition. Official sources last verified June 2026.
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