This guide summarizes the MUTCD requirements and practical application guidance for the W20-5a 2 LANES CLOSED sign. Use this resource to understand when it is required, how to place it correctly, and how to maintain clear visibility for safe operations.
Double-lane closures on multilane streets and freeways
Advance warning area, ahead of the work.
Mount at the standard height and setback for the roadway with clear sight lines.
High reflectivity and clear sight lines are essential day and night.
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.
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. 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.
Advance warning area, ahead of the work.
Typical minimum: 48" × 48" on conventional roads; 60" × 60" on expressways and freeways.
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.
Go to California NotesEducational reference only. This is not an official Caltrans, FHWA, or local agency publication and is not legal or engineering advice. Always verify sign selection, size, placement, spacing, and application against the current CA MUTCD 2026, Caltrans sign specifications, Standard Plans, project documents, and the reviewing agency’s requirements. Local jurisdictions may impose additional requirements, and final selection, placement, and dimensions may require engineering judgment or agency approval. Written against California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition. Official sources last verified June 2026.
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