R4-8a Keep Left — Horizontal Arrow
Directs road users to pass to the left, using a word legend and horizontal arrow.
- Sign Name
- Keep Left — Horizontal Arrow
- MUTCD Code
- R4-8a
- Sign Category
- Regulatory Signs
Specifications
- Shape
- Rectangle (Vertical)
- Color / legend
- Black legend and border on white background
Sizes & Dimensions (inches)
These sizes are listed in the linked California MUTCD table. Use the applicable roadway column and confirm the approved design and fabrication details with the roadway authority.
Sign face extracted from the adopted California manual figure; sizes from Table 2B-1. No dimensioned fabrication drawing is offered for this entry. Check road-type columns in the source table.
- CA MUTCD Table 2B-124" × 30"
- CA MUTCD Table 2B-136" × 48"
- CA MUTCD Table 2B-148" × 60"
- CA MUTCD Table 2B-118" × 24"
California Application & Variants
Match the leftward arrow and the roadway feature. Review the word-legend application where an island channels traffic away from the approach.
When & Where It's Used
- Regulatory signing review
Placement Context
- Where it sits
- Match the leftward arrow and the roadway feature. Review the word-legend application where an island channels traffic away from the approach..
- CA MUTCD reference
- CA MUTCD 2026 §2B.39
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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. Reference editions: California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition with Revision 1.
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