A supplemental LEFT LANE plaque used above or below a mandatory-movement lane-control sign (the R3-5 series) to show that the required movement applies to the left lane. It carries the word legend LEFT LANE and is not used alone.
Mounted with an R3-5 mandatory-movement lane-control sign. Confirm placement and supplemental plaques against the applicable CA MUTCD standard.
View this sign on the Federal MUTCD (FHWA)California-specific application notes and adoptions may differ. Review California requirements where applicable.
A supplemental LEFT LANE plaque used above or below a mandatory-movement lane-control sign (the R3-5 series) to show that the required movement applies to the left lane. It carries the word legend LEFT LANE and is not used alone.
A supplemental LEFT LANE plaque used above or below a mandatory-movement lane-control sign (the R3-5 series) to show that the required movement applies to the left lane. It carries the word legend LEFT LANE and is not used alone. In the field, R3-5bP Left Lane is typically positioned at the advance warning area, ahead of the work. Common deployments include mounted with an R3-5 mandatory-movement lane-control sign; identifies the left lane at multilane work-zone approaches; used where movements are assigned lane by lane. Always confirm its size, retroreflective sheeting, spacing, and placement against the CA MUTCD 2026 and the reviewing agency before finalizing the traffic control plan.
Learn more about Left Lane sign requirementsUsed in California with a mandatory movement lane-control sign to indicate the left lane the control applies to, where a work-zone approach assigns movements by lane.
In Los Angeles, temporary regulatory changes (speed, one-way, turn or entry restrictions) generally involve LADOT review, and on state highways Caltrans District 7. Regulatory authority cannot be created by signing alone — confirm the change is authorized by the agency with jurisdiction over the roadway.
Confirm the plaque matches the lane it labels and the movement sign it supplements. Public Ready reviews lane-use control signing.
Educational 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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