This guide summarizes the MUTCD requirements and practical application guidance for the W20-3 ROAD CLOSED AHEAD sign. Use this resource to understand when it is required, how to place it correctly, and how to maintain clear visibility for safe operations.
Advance warning ahead of a full roadway closure
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 the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure.
Warns that the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure. In the field, W20-3 Road Closed Ahead is typically positioned at the advance warning area, ahead of the work. Common deployments include advance warning ahead of a full roadway closure; used with R11-2 / R11-3a and detour markers; common on utility cuts, paving, and emergency closures. 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.
Placed in advance of a closure in a California TTC zone, working together with regulatory ROAD CLOSED (R11-2) signing and detour route markers at the closure point.
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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