This guide summarizes the MUTCD requirements and practical application guidance for the G20-1(CA) ADVANCE LANE ASSIGNMENT SIGN 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 destination-to-lane assignment ahead of a junction or lane drop
At the decision point, junction, or service location the sign serves, per CA MUTCD Part 2 and Caltrans placement standards.
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.
The G20-1(CA) Advance Lane Assignment sign is a California guide sign that tells drivers, in advance of a junction or lane drop, which lane serves a given destination — a named destination shown above a lane legend such as RIGHT LANE or LEFT LANE. It is a green guide sign with white legend, shown here with its California MUTCD Sign Chart face. It is a distinct sign from the federal G20-1 'Road Work Next XX Miles' construction sign that shares the number.
The G20-1(CA) Advance Lane Assignment sign is a California guide sign that tells drivers, in advance of a junction or lane drop, which lane serves a given destination — a named destination shown above a lane legend such as RIGHT LANE or LEFT LANE. It is a green guide sign with white legend, shown here with its California MUTCD Sign Chart face. It is a distinct sign from the federal G20-1 'Road Work Next XX Miles' construction sign that shares the number. In the field, G20-1(CA) Advance Lane Assignment Sign is typically positioned at the beginning of the work zone (advance/upstream). Common deployments include advance destination-to-lane assignment ahead of a junction or lane drop; selected and sized for the roadway type and approach speed; coordinated with the overall guide-signing plan. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
At the decision point, junction, or service location the sign serves, per CA MUTCD Part 2 and Caltrans placement standards.
Typical minimum: 48" × 24".
Used in California on approaches to interchanges, lane drops, and major junctions to assign a destination to a specific lane ahead of the decision point, per the CA MUTCD and the Caltrans Sign Specification for G20-1(CA).
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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