NO U-TURN Sign Requirements

1. When a NO U-TURN Sign Is Used

Prohibits a U-turn at the location where the sign is posted, shown with the U-turn arrow symbol inside a red prohibition circle and slash.

• Prohibiting U-turns at closed median openings
• Work zones with shifted or realigned lanes
• Locations where a U-turn would conflict with construction activity

2. How and Where It Applies

In the field, R3-4 No U-Turn is typically positioned at the advance warning area, ahead of the work. Common deployments include prohibiting U-turns at closed median openings; work zones with shifted or realigned lanes; locations where a U-turn would conflict with construction activity. 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 R3-4 at the point where the regulation applies, per CA MUTCD Part 2B.

• 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: Per CA MUTCD minimum for the roadway type.

• 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 where a U-turn creates a hazard, such as when a median opening is closed, a divider is shifted, or a roadway is realigned.

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.