2 LANES CLOSED Sign Requirements

1. When a 2 LANES CLOSED Sign Is Used

Warns that two travel lanes are closed ahead (shown with the distance to the closure) so drivers can merge out of the affected lanes well in advance.

• Double-lane closures on multilane streets and freeways
• Posted with the distance to the start of the closure
• Paired with arrow boards and channelizing devices at each taper

2. How and Where It Applies

In the field, W20-5a 2 Lanes Closed is typically positioned at the advance warning area, ahead of the work. Common deployments include double-lane closures on multilane streets and freeways; posted with the distance to the start of the closure; paired with arrow boards and channelizing devices at each taper. 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 W20-5a advance warning area, ahead of the work.

• 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: 48" × 48" on conventional roads; 60" × 60" on expressways and freeways.

• 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 on California multilane roadways where two lanes close together, posted with the distance (for example, 2 RIGHT LANES CLOSED 1/2 MILE) ahead of the merging tapers.

6. Common Field or Planning Mistakes

• Merge direction on the sign does not match the open lane in the field.
• Taper begins before the lane-closure warning is reached.
• Sign spacing not adjusted for the posted speed.
• Wrong size specified for a multilane facility.