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Work Zone Basics
Temporary Traffic Control
MUTCD Overview
Traffic Control Devices
Work Zone Layout
Lane Closures and Detours
Pedestrian Access
Flagging Operations
Public Right-of-Way Work
Permits and Documentation
Common Compliance Issues

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Home / Signs / M4 Series — Detour Route Markers

M4 Series — Detour Route Markers

The M4 series marks detour routes that guide traffic around closed or restricted roadways.

📊 View M4 Series — Detour Route Markers on the Sign Chart →

M4-8 Detour
M4-8
Detour
Guide Signs
M4-9 Detour Arrow
M4-9
Detour Arrow
Guide Signs
M4-9a End Detour
M4-9a
End Detour
Guide Signs
M4-9b Pedestrian Detour
M4-9b
Pedestrian Detour
Guide Signs
M4-9b(CA) Pedestrian Detour (California)
M4-9b(CA)
Pedestrian Detour (California)
Guide Signs

An educational resource for work zone compliance, temporary traffic control, public right-of-way readiness, and related field planning concepts. Requirements vary by jurisdiction, project type, agency, roadway, permit condition, and approved plan.

Work Zone Compliance is a Public Ready knowledge resource.

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Topics

Work Zone Basics
Temporary Traffic Control
MUTCD Overview
Traffic Control Devices
Work Zone Layout
Lane Closures and Detours

More Topics

Pedestrian Access
Flagging Operations
Public Right-of-Way Work
Permits and Documentation
Common Compliance Issues
Glossary

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Work Zone Compliance is a Public Ready knowledge resource. Public Ready supports traffic control plan coordination, permit readiness, and agency coordination across Southern California.

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