DO NOT ENTER Sign Requirements

1. When a DO NOT ENTER Sign Is Used

Prohibits entry into a roadway or lane, telling drivers they must not proceed past the sign in that direction.

• Preventing entry into closed lanes or ramps
• Reinforcing one-way operations through a work zone
• Used with WRONG WAY where wrong-way risk exists

2. How and Where It Applies

In the field, R5-1 Do Not Enter is typically positioned at the point of regulation within the activity area. Common deployments include preventing entry into closed lanes or ramps; reinforcing one-way operations through a work zone; used with WRONG WAY where wrong-way risk exists. 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 R5-1 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" × 36".

• 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 prevent wrong-way entry into closed lanes, ramps, or one-way segments created by the traffic control 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.