M4-8 Detour
Identifies an approved detour route, marking the path drivers should follow around a closure when used with directional arrows.
- Sign Name
- Detour
- MUTCD Code
- M4-8
- Sign Category
- Detour Signs
Specifications
- Shape
- Rectangle (Horizontal)
- Color / legend
- Orange background, black legend (temporary traffic control use)
Sizes & Dimensions (inches)
These are dimensions shown on the linked layout. Select the required size using the applicable MUTCD and agency requirements; the smallest drawing size is not necessarily the permitted minimum.
- Layout 112" × 6"
- Layout 224" × 12"
- Layout 330" × 15"
When & Where It's Used
- Marking the detour route around a closure
- Mounted with M4-9 directional arrows at decision points
- Used with W20-2 DETOUR AHEAD advance warning
Placement Context
- Where it sits
- At the detour decision point or route assembly identified by the design.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 6I — TTC Zone Guide Signs
Related Signs
Browse Detour Signs
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.
Need to Rent or Purchase This Sign? Contact Public Ready.
Public Ready supports sign selection, project-ready sign packages, and equipment sourcing through qualified providers — with expert support built for compliance.