REVERSE TURN (LEFT) Sign Requirements
This guide summarizes the MUTCD requirements and practical application guidance for the W1-3L REVERSE TURN (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
Placed ahead of a left-then-right reverse turn in the alignment
Where It Applies
In advance of the first turn of a reverse-turn (left-then-right) roadway alignment.
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 REVERSE TURN (LEFT) Sign Is Used
The W1-3L Reverse Turn (Left) sign warns of two turns in opposite directions that are separated by a short tangent, where the first turn is to the left. The angular symbol distinguishes a reverse turn from the smoother reverse curve (W1-4).
- Placed ahead of a left-then-right reverse turn in the alignment
- Used on work-zone diversions and temporary lane shifts
- Sized and placed for the approach speed per the CA MUTCD
2. How and Where It Applies
In the field, W1-3L Reverse Turn (Left) is typically positioned at the in advance of the first turn of a reverse-turn (left-then-right) roadway alignment. Common deployments include placed ahead of a left-then-right reverse turn in the alignment; used on work-zone diversions and temporary lane shifts; sized and placed for the approach speed per the CA MUTCD. 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 W1-3L in advance of the first turn of a reverse-turn (left-then-right) roadway alignment.
- 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: 30" × 30" on conventional roads (36" × 36" multilane); 36" × 36" on expressways and freeways; 48" × 48" oversized.
- Choose size based on roadway speed, sight distance, and mounting location.
- Maintain high retroreflectivity for maximum night and adverse-weather visibility.
5. California Notes
W1-3L Reverse Turn (Left) is used in California per the CA MUTCD ahead of a reverse-turn alignment beginning with a left turn, including work-zone diversions. Confirm its size, retroreflective sheeting, placement, and spacing against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
Go to California Notes6. Common Field or Planning Mistakes
- Sign not shown at the correct advance distance for the posted speed.
- Advance warning sign missing or out of sequence on the TCP.
- Wrong size specified for the roadway classification (conventional vs. expressway).
- Sign sheeting / retroreflectivity class not noted on the plan.
Related Resources
View All W-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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