ONE WAY (LEFT) Sign Requirements
This guide summarizes the MUTCD requirements and practical application guidance for the R6-2L ONE WAY (LEFT) sign. Use this resource to understand when it is required, how to place it correctly, and how to maintain clear visibility for safe operations.
When It Is Used
Defining temporary one-way streets or segments
Where It Applies
Advance warning area, ahead of the work.
Placement Basics
Mount at the standard height and setback for the roadway with clear sight lines.
Visibility / Reflectivity
High reflectivity and clear sight lines are essential day and night.
1. When a ONE WAY (LEFT) Sign Is Used
Indicates that traffic on the roadway flows in one direction only, to the left, as shown by the arrow below the ONE WAY legend.
- Defining temporary one-way streets or segments
- Confirming direction at detour and closure points
- Used with DO NOT ENTER and WRONG WAY
2. How and Where It Applies
In the field, R6-2L One Way (Left) is typically positioned at the advance warning area, ahead of the work. Common deployments include defining temporary one-way streets or segments; confirming direction at detour and closure points; used with DO NOT ENTER and WRONG WAY. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
3. Placement and Application Notes
Position R6-2L advance warning area, ahead of the work.
- Place the sign where drivers have a clear, unobstructed view on approach.
- Mount at the standard height and setback from the edge of the traveled way.
- Do not mount with other signs on the same post unless space constraints require it.
4. Standard Sizes and Visibility Considerations
Typical minimum: 36" × 12".
- Choose size based on roadway speed, sight distance, and mounting location.
- Maintain high retroreflectivity for maximum night and adverse-weather visibility.
5. California Notes
Used in California work zones to define temporary one-way operation and confirm the permitted direction of travel through the setup.
Go to California Notes6. Common Field or Planning Mistakes
- Temporary regulatory control not warranted or conflicts with existing control.
- Reduced speed limit posted without proper speed-setting authorization.
- Wrong-way protection (DO NOT ENTER / WRONG WAY) missing at closed approaches.
- Sign size not appropriate for the facility.
Related Resources
View All R-Series Signs
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. 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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