M4 Series — Detour and Alternate Route Markers

M4 detour signs and plaques guide road users around a closed segment. M4-9a serves pedestrians and bicyclists, M4-9b pedestrians, and M4-9c bicyclists.

10

Signs in M4

4

Download Formats

Reference

Verify Current Standards

Series

Sign Code

Category

Showing 1–10 of 10 M4 Series Signs

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Bicyclist/Pedestrian Detour

Pedestrian Detour (California)

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M4-9c

Bicyclist Detour (with arrow)

Complete sign index — all 10 signs in M4 Series

Related Resources

Sign Downloads

Find artwork, available official layouts, and manual references for individual signs.

Browse downloads

Work Zone Compliance

Ensure your signs meet MUTCD and Caltrans requirements.

Visit WorkZoneCompliance.com

Download Guide

Learn about file formats, uses, and best practices.

View Download Guide

Need M4 Series signs for a California project?

Public Ready can help you source, rent, or purchase the traffic control signs in this series through qualified providers, with expert support.

Contact Public Ready or call (323) 900-9824