NARROW TWO-WAY TRAFFIC Sign Requirements

1. When a NARROW TWO-WAY TRAFFIC Sign Is Used

The W6-4 Narrow Two-Way Traffic sign warns that the roadway ahead narrows to a two-way, two-lane operation with opposing traffic on the other side of the center line. The two opposing arrows indicate traffic moving in both directions past the sign. In temporary traffic control it is shown on an orange background, commonly where a lane closure or crossover sets up a narrow two-way section.

• Approach to a narrow two-way, two-lane operation around a work area
• Used where a lane closure or crossover creates a two-way section
• Sized and placed per the CA MUTCD and the roadway type

2. How and Where It Applies

In the field, W6-4 Narrow Two-Way Traffic is typically positioned at the on the approach to a narrow section that carries two-way traffic (for example a two-lane, two-way operation set up around the work area). Common deployments include approach to a narrow two-way, two-lane operation around a work area; used where a lane closure or crossover creates a two-way section; sized and placed per the CA MUTCD and the roadway type. 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 W6-4 on the approach to a narrow section that carries two-way traffic (for example a two-lane, two-way operation set up around the work area).

• 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" × 36"; 36" × 48" on higher-speed roadways.

• Choose size based on roadway speed, sight distance, and mounting location.
• Maintain high retroreflectivity for maximum night and adverse-weather visibility.

5. California Notes

W6-4 Narrow Two-Way Traffic is used in California per the CA MUTCD to warn drivers of a narrow two-way operation set up around a work area. Confirm its size, retroreflective sheeting, placement, and spacing against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.

6. 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.