ONE WAY (LEFT) Sign Requirements

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 horizontal arrow.

• 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

Indicates that traffic on the roadway flows in one direction only, to the left, as shown by the horizontal arrow. In the field, R6-1 One Way (Left) is typically positioned at the point of regulation within the activity area. 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

Point of regulation within the activity 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: 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.

6. 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.