This guide summarizes the MUTCD requirements and practical application guidance for the W20-5b BIKE LANE 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.
Bike-lane closures for roadway and utility work
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 bicycle lane is closed ahead, with the word legend BIKE LANE CLOSED (a distance line is added on the advance version), so bicyclists can prepare to merge or follow a signed alternate route before reaching the work.
Warns that the bicycle lane is closed ahead, with the word legend BIKE LANE CLOSED (a distance line is added on the advance version), so bicyclists can prepare to merge or follow a signed alternate route before reaching the work. In the field, W20-5b Bike Lane Closed is typically positioned at the advance warning area, ahead of the work. Common deployments include bike-lane closures for roadway and utility work; advance sign carries a distance line (e.g. X FT / AHEAD); paired with bicycle merge or bike-detour guidance. 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 in California where a work zone closes a bike lane, alerting bicyclists in advance of the closure and directing them to merge with traffic or follow a signed detour per the CA MUTCD.
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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