This guide summarizes the MUTCD requirements and practical application guidance for the R1-1 STOP sign. Use this resource to understand when it is required, how to place it correctly, and how to maintain clear visibility for safe operations.
Temporary intersection and access control
At the point where the regulation applies, per CA MUTCD Part 2B.
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.
Requires every driver to come to a complete stop at the marked stop line, crosswalk, or intersection before proceeding when it is safe.
Requires every driver to come to a complete stop at the marked stop line, crosswalk, or intersection before proceeding when it is safe. In the field, R1-1 Stop is typically positioned at the point of regulation within the activity area. Common deployments include temporary intersection and access control; portable stop control at construction entrances; reinforcing right-of-way around a work area. 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 the point where the regulation applies, per CA MUTCD Part 2B.
Typical minimum: 30" × 30" minimum; 36" × 36" on multilane or higher-speed roads.
Used in California work zones as part of temporary intersection or access control, including portable STOP signs at temporary approaches.
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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