M4-9b(CA) PEDESTRIAN DETOUR (CALIFORNIA) Requirements
Application notes for M4-9b(CA) PEDESTRIAN DETOUR (CALIFORNIA). The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
1. When PEDESTRIAN DETOUR (CALIFORNIA) Is Used
Directs pedestrians along a detour using the pedestrian symbol and an arrow. This catalog entry uses a California label for the federal M4-9b design; the linked official drawing is M4-9b.
- Accessible pedestrian routing around closures
- Used with R9-series sidewalk-closure signs
- California right-of-way and encroachment-permit work
2. Placement and Application Notes
Position M4-9b(CA) at the detour decision point or route assembly identified by the design.
- Place the sign where the intended road users have a clear, unobstructed view on approach.
- Use the mounting height and lateral placement specified for the sign and installation type.
- Use sign assemblies and supplemental plaques only as provided in the applicable manual and approved design.
3. Layout Sizes and Visibility Considerations
Linked-layout dimensions: 30" × 24". Check the applicable MUTCD and agency requirements for the required installation size.
- Choose size based on roadway speed, sight distance, and mounting location.
- Use the visibility and material requirements specified for this sign and installation.
4. Sign Selection Checks
- Match M4-9b(CA) and its displayed legend to the intended condition.
- Check the source drawing for the required directional or message variant.
- Check continuity and accessibility of the pedestrian route through or around the affected area.
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Verify M4-9b(CA) Requirements
This is an educational reference. Verify sign use, size, placement, and application against the current CA MUTCD, Caltrans sign specifications, Standard Plans, and the reviewing agency. Official source links are gathered in one place.
View official sourcesEducational 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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